Khái niệm hàm số và đồ thị của hàm số

Home Lớp 8 Toán lớp 8 - Sách Kết nối tri thức Bài 27. Khái niệm hàm số và đồ thị của hàm sốBài tập cơ bản

{"common":{"save":0,"post_id":"6637","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6631","post_id":"6637","mon_id":"1158921","chapter_id":"1158933","question":"Cho các b\u1ea3ng sau xác \u0111\u1ecbnh các giá tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a x và y.<\/p><svg height=\"230\" width=\"400\"> <g><title><\/title><rect fill=\"#fff\" height=\"232\" id=\"canvas_background\" width=\"402\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><rect fill=\"#fff\" height=\"71\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"182.99999\" x=\"7.95453\" y=\"11.88636\"><\/rect> <line fill=\"none\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"9\" x2=\"191\" y1=\"44.88636\" 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x=\"54.95453\" xml:space=\"preserve\" y=\"35.88636\">0,5<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"109.95453\" xml:space=\"preserve\" y=\"35.88636\">1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"154.95453\" xml:space=\"preserve\" y=\"35.88636\">1,5<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"54.95453\" xml:space=\"preserve\" y=\"71.88636\">2,5<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"109.95453\" xml:space=\"preserve\" y=\"72.88636\">3<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"154.95453\" xml:space=\"preserve\" y=\"71.88636\">4,5<\/text> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_12\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"96\" x2=\"96\" y1=\"11.88636\" y2=\"81.88636\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_13\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"139\" x2=\"139\" y1=\"11.88636\" y2=\"81.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_14\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"70.95453\" xml:space=\"preserve\" y=\"104.88636\">B\u1ea3ng 1<\/text> <rect fill=\"#fff\" height=\"71\" id=\"svg_15\" stroke=\"#000\" stroke-width=\"1.5\" width=\"182.99999\" x=\"209.95453\" y=\"11.88636\"><\/rect> <line fill=\"none\" id=\"svg_16\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"211\" x2=\"393\" y1=\"44.88636\" y2=\"45\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_17\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"252.95453\" x2=\"252.95453\" y1=\"10.88636\" y2=\"81.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"220.95453\" 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font-size=\"20\" id=\"svg_22\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"362.95453\" xml:space=\"preserve\" y=\"35.88636\">1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_23\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"256.95453\" xml:space=\"preserve\" y=\"71.88636\">3<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_24\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"314.95453\" xml:space=\"preserve\" y=\"72.88636\">5<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_25\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"356.95453\" xml:space=\"preserve\" y=\"71.88636\">3<\/text> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_26\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"298\" x2=\"298\" y1=\"11.88636\" y2=\"81.88636\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_27\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"341\" x2=\"341\" y1=\"11.88636\" y2=\"81.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_28\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"272.95453\" xml:space=\"preserve\" y=\"104.88636\">B\u1ea3ng 2<\/text> <rect fill=\"#fff\" height=\"71\" id=\"svg_29\" stroke=\"#000\" stroke-width=\"1.5\" width=\"182.99999\" x=\"7.95453\" y=\"130.88636\"><\/rect> <line fill=\"none\" id=\"svg_30\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"9\" x2=\"191\" y1=\"163.88636\" y2=\"164\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_31\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"50.95453\" x2=\"50.95453\" y1=\"129.88636\" y2=\"200.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_32\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"18.95453\" xml:space=\"preserve\" y=\"156.88636\">x<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_33\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"19.95453\" xml:space=\"preserve\" y=\"190.88636\">y<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_34\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"63.95453\" xml:space=\"preserve\" y=\"154.88636\">0<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_35\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"109.95453\" xml:space=\"preserve\" y=\"154.88636\">1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_36\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"154.95453\" xml:space=\"preserve\" y=\"154.88636\">1,5<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_37\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"62.95453\" xml:space=\"preserve\" y=\"190.88636\">0<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_38\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"109.95453\" xml:space=\"preserve\" y=\"191.88636\">2<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_39\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"161.95453\" xml:space=\"preserve\" y=\"190.88636\">3<\/text> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_40\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"96\" x2=\"96\" y1=\"130.88636\" y2=\"200.88636\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_41\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"139\" x2=\"139\" y1=\"130.88636\" y2=\"200.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_42\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"70.95453\" xml:space=\"preserve\" y=\"223.88636\">B\u1ea3ng 3<\/text> <rect fill=\"#fff\" height=\"71\" id=\"svg_43\" stroke=\"#000\" stroke-width=\"1.5\" width=\"182.99999\" x=\"207.95453\" y=\"131.88636\"><\/rect> <line fill=\"none\" id=\"svg_44\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"209\" x2=\"391\" y1=\"164.88636\" y2=\"165\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_45\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"250.95453\" x2=\"250.95453\" y1=\"130.88636\" y2=\"201.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_46\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"218.95453\" xml:space=\"preserve\" y=\"157.88636\">x<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_47\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"219.95453\" xml:space=\"preserve\" y=\"191.88636\">y<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_48\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"262.95453\" xml:space=\"preserve\" y=\"155.88636\">-1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_49\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"309.95453\" xml:space=\"preserve\" y=\"155.88636\">2<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_50\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"357.95453\" xml:space=\"preserve\" y=\"155.88636\">-1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_51\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"261.95453\" xml:space=\"preserve\" y=\"191.88636\">-2<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_52\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"309.95453\" xml:space=\"preserve\" y=\"192.88636\">3<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_53\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"363.95453\" xml:space=\"preserve\" y=\"191.88636\">2<\/text> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_54\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"296\" x2=\"296\" y1=\"131.88636\" y2=\"201.88636\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_55\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"339\" x2=\"339\" y1=\"131.88636\" y2=\"201.88636\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_56\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"270.95453\" xml:space=\"preserve\" y=\"224.88636\">B\u1ea3ng 4<\/text> <\/g> <\/svg><\/span><\/p>B\u1ea3ng nào không <\/strong>xác \u0111\u1ecbnh y là hàm s\u1ed1 t\u01b0\u01a1ng \u1ee9ng c\u1ee7a x?<\/p>","options":["A. <\/strong>B\u1ea3ng 1","B. <\/strong>B\u1ea3ng 2","C. <\/strong>B\u1ea3ng 3","D. <\/strong>B\u1ea3ng 4"],"correct":"4","level":"1","hint":"","answer":"Xét b\u1ea3ng 4: \u0110\u1ea1i l\u01b0\u1ee3ng y không<\/strong> ph\u1ea3i hàm s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng x vì v\u1edbi x = –1, ta xác \u0111\u1ecbnh \u0111\u01b0\u1ee3c 2 giá tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a y (y = –2 và y = 2).<\/p>Ch\u1ecdn D. <\/strong>B\u1ea3ng 4<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-08-29 23:08:25","option_type":"txt","len":0},{"id":"6633","post_id":"6637","mon_id":"1158921","chapter_id":"1158933","question":"Cho hàm s\u1ed1 $y=f(x)=2x+3$<\/span>. Tính $f(-3)$<\/span>.<\/p>","options":["A.<\/strong> f(–3) = 3 ","B.<\/strong> f(–3) = –3 ","C.<\/strong> f(–3) = –5","D.<\/strong> f(–3) = 0"],"correct":"2","level":"1","hint":"","answer":"Ta có: $f(-3)=2.(-3)+3=-3$<\/span><\/p>Ch\u1ecdn B.<\/strong> f(–3) = –3 <\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-08-29 23:09:18","option_type":"txt","len":2},{"id":"6635","post_id":"6637","mon_id":"1158921","chapter_id":"1158933","question":"Cho hàm s\u1ed1 $y=f(x)=5-2x$<\/span>. K\u1ebft lu\u1eadn nào \u0111úng<\/strong>?<\/p>","options":["A.<\/strong> $f(0)=2$<\/span>","B.<\/strong> $f(1)=-3$<\/span>","C.<\/strong> $f(-1)=7$<\/span>","D.<\/strong> $f(2)=3$<\/span>"],"correct":"3","level":"1","hint":"","answer":"A.<\/strong> $f(0)=2$<\/span>        sai vì $f(0)=5-2.0=5$<\/span><\/p>B.<\/strong> $f(1)=-3$<\/span>     sai vì $f(1)=5-2.1=3$<\/span><\/p>C.<\/strong> $f(-1)=7$<\/span>     \u0111úng <\/span>vì $f(-1)=5-2.(-1)=7$<\/span><\/p>D.<\/strong> $f(2)=3$<\/span>        sai vì $f(2)=5-2.2=1$<\/span><\/p>Ch\u1ecdn C.<\/strong> $f(-1)=7$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-08-30 21:40:36","option_type":"math","len":0}]}