Số thập phân - Bài tập trung bình

Home Lớp 6 Toán lớp 6 - Sách kết nối tri thức Bài 28: Số thập phânBài tập trung bình

{"common":{"save":0,"post_id":"4600","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6756","post_id":"4600","mon_id":"1158113","chapter_id":"1158126","question":"S\u1eafp x\u1ebfp các s\u1ed1 sau theo th\u1ee9 t\u1ef1 t\u0103ng d\u1ea7n<\/strong><\/p>3,8   ;   -5,7   ;    0,2   ;    -6,5   ;   -0,4   ;   16,71<\/p>","options":["A.<\/strong> 16,71 < 3,8 < 0,2 < -0,4 < -5,7 < -6,5 ","B.<\/strong> -6,5 < -5,7 < -0,4 < 0,2 < 3,8 < 16,71"],"correct":"2","level":"2","hint":"S\u1ed1 th\u1eadp phân âm luôn nh\u1ecf h\u01a1n s\u1ed1 0 và s\u1ed1 th\u1eadp phân d\u01b0\u01a1ng. <\/p>Trong hai s\u1ed1 th\u1eadp phân âm, s\u1ed1 th\u1eadp phân nào có s\u1ed1 \u0111\u1ed1i l\u1edbn h\u01a1n thì nh\u1ecf h\u01a1n.<\/p>","answer":"Chia làm hai nhóm:<\/p>S\u1ed1 th\u1eadp phân âm:         -6,5  <   -5,7   <  -0,4     (vì 6,5   >  5,7   >  0,4 )<\/p>S\u1ed1 th\u1eadp phân d\u01b0\u01a1ng:   0,2  <   3,8   <   16,71<\/p>Do \u0111ó s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 t\u0103ng d\u1ea7n<\/strong> là    B.<\/strong><\/span> -6,5  <  -5,7 <    -0,4  <   0,2  <   3,8   <  16,71<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-28 11:02:14","option_type":"txt","len":3},{"id":"6758","post_id":"4600","mon_id":"1158113","chapter_id":"1158126","question":"S\u1eafp x\u1ebfp các s\u1ed1 sau theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n<\/strong><\/p>0,5  ;   -5<\/span>4<\/span><\/span>   ;   -6<\/span>5<\/span><\/span>   ;    0   ;   7<\/span>11<\/span><\/span>    ;   -1,7<\/p>","options":["$\\dfrac{7}{11} > 0,5 >0>\\dfrac{-6}{5}>\\dfrac{-5}{4}>-1,7$<\/span>","$\\dfrac{7}{11} > 0,5 >0>\\dfrac{-5}{4}>\\dfrac{-6}{5}>-1,7$<\/span>","$ 0,5 > \\dfrac{7}{11} >0>\\dfrac{-6}{5}>\\dfrac{-5}{4}>-1,7$<\/span>"],"correct":"1","level":"2","hint":"Vi\u1ebft các s\u1ed1 th\u1eadp phân v\u1ec1 d\u1ea1ng phân s\u1ed1 r\u1ed3i so sánh các phân s\u1ed1 v\u1edbi nhau.<\/p>","answer":"Chia làm hai nhóm:<\/p>Các s\u1ed1 không âm: <\/strong> 0,5 = $\\dfrac{5}{10}=\\dfrac{1}{2}$<\/span>     ; 0  ;  $\\dfrac{7}{11}$<\/span>   (m\u1eabu chung là 22)<\/p>Vì   $\\dfrac{1}{2}=\\dfrac{11}{22}$<\/span>  ;   $\\dfrac{7}{11}=\\dfrac{14}{22}$<\/span>    mà   $\\dfrac{14}{22}$<\/span>  >  $\\dfrac{11}{22}$<\/span>  >  0   nên     $\\dfrac{7}{11} > 0,5 >0$<\/span><\/span> .<\/p>Các s\u1ed1 âm<\/strong>:   $\u200b\u200b\\dfrac{-5}{4} $<\/span>  ;  $\\dfrac{-6}{5}$<\/span>  ;   -1,7 = $\\dfrac{-17}{10}$<\/span>     (m\u1eabu chung là  20)<\/p>Vì  $\\dfrac{-5}{4}=\\dfrac{-25}{20}$<\/span>  ;  $\\dfrac{-6}{5}=\\dfrac{-24}{20}$<\/span>  ;  $\\dfrac{-17}{10} = \\dfrac{-34}{20}$<\/span>  mà $\\dfrac{-24}{20}>\\dfrac{-25}{20}>\\dfrac{-34}{20}$<\/span>  nên  $\\dfrac{-6}{5}>\\dfrac{-5}{4}>-1,7$<\/span><\/span> .<\/p>Do \u0111ó s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n<\/strong><\/span> là  $\\dfrac{7}{11} > 0,5 >0>\\dfrac{-6}{5}>\\dfrac{-5}{4}>-1,7$<\/span><\/span><\/p>Chú ý.<\/strong> 1\/ Các s\u1ed1 không âm<\/strong> là các s\u1ed1 l\u1edbn h\u01a1n 0 ho\u1eb7c b\u1eb1ng 0<\/strong>.<\/p>2\/ \u0110\u1ec3 \u0111\u1ed5i t\u1eeb s\u1ed1 th\u1eadp phân sang phân s\u1ed1 ta vi\u1ebft s\u1ed1 th\u1eadp phân thành phân s\u1ed1 th\u1eadp phân t\u01b0\u01a1ng \u1ee9ng r\u1ed3i rút g\u1ecdn v\u1ec1 t\u1ed1i gi\u1ea3n n\u1ebfu có th\u1ec3.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-28 11:21:17","option_type":"math","len":0},{"id":"6760","post_id":"4600","mon_id":"1158113","chapter_id":"1158126","question":"N\u1ed1i s\u1ed1 th\u1eadp phân v\u1edbi phân s\u1ed1 t\u01b0\u01a1ng \u1ee9ng.<\/p>","options":[["-302,6","-0,204","-11,08"],["$\\dfrac{}{}$<\/span>$\\dfrac{-51}{250}$<\/span>","$\\dfrac{-1513}{5}$<\/span>","$\\dfrac{-277}{25}$<\/span>"],["$\\dfrac{-1513}{5}$<\/span>","$\\dfrac{}{}$<\/span>$\\dfrac{-51}{250}$<\/span>","$\\dfrac{-277}{25}$<\/span>"]],"correct":[1,0,2],"level":"2","hint":"Vi\u1ebft s\u1ed1 th\u1eadp phân v\u1ec1 phân s\u1ed1 th\u1eadp phân r\u1ed3i rút g\u1ecdn v\u1ec1 phân s\u1ed1 t\u1ed1i gi\u1ea3n.<\/p>","answer":"-302,6 <\/span>= $\\dfrac{-3026}{10}$<\/span> = $\\dfrac{-1513}{5}$<\/span><\/span><\/p>-0,204<\/span> = $\\dfrac{-204}{1000}$<\/span>  =  $\\dfrac{51}{250}$<\/span><\/span><\/p>-11,08<\/span> = $\\dfrac{-1108}{100}$<\/span> = $\\dfrac{-277}{25}$<\/span><\/span><\/p>\u0110áp án \u0111úng là  <\/p>-302,6 <\/span> = $\\dfrac{-1513}{5}$<\/span><\/span><\/p>-0,204<\/span>  =  $\\dfrac{51}{250}$<\/span><\/span><\/p>-11,08<\/span>  = $\\dfrac{-277}{25}$<\/span><\/span><\/p>","type":"matching","extra_type":"mat_img","time":"0","user_id":"131","test":"1","date":"2021-08-28 11:34:45","txt_size":"txt_small"}]}