tính từng các bước 11/143+-3/7 -8/7+-12/-30 5/10+-6/8 7/21+-30/-40 -19/5+2/3- 11/3+15/25 1/3+2/7+-8/21 VD ; 1/3+2/5 =1/3+2/5 =5/15+6/15 =11/15

tính từng các bước
11/143+-3/7
-8/7+-12/-30
5/10+-6/8
7/21+-30/-40
-19/5+2/3-
11/3+15/25
1/3+2/7+-8/21
VD ;
1/3+2/5
=1/3+2/5
=5/15+6/15
=11/15

0 bình luận về “tính từng các bước 11/143+-3/7 -8/7+-12/-30 5/10+-6/8 7/21+-30/-40 -19/5+2/3- 11/3+15/25 1/3+2/7+-8/21 VD ; 1/3+2/5 =1/3+2/5 =5/15+6/15 =11/15”

  1. Đáp án:

     

    Giải thích các bước giải:

    $\frac{11}{143}$ + $\frac{-3}{7}$ = $\frac{11}{143}$ – $\frac{3}{7}$ = $\frac{77}{1001}$ +$\frac{429}{1001}$ = $\frac{506}{1001}$ = $\frac{46}{91}$

    $\frac{-8}{7}$ + $\frac{-12}{-30}$ = $\frac{-8}{7}$ + $\frac{2}{5}$ = $\frac{-40}{35}$ +$\frac{14}{35}$ = $\frac{-26}{35}$

    $\frac{5}{10}$ + $\frac{-6}{8}$ = $\frac{1}{2}$ – $\frac{3}{4}$ = $\frac{2}{4}$ – $\frac{3}{4}$ = $\frac{-1}{4}$

    $\frac{7}{21}$ + $\frac{-30}{-40}$ = $\frac{1}{3}$ + $\frac{3}{4}$ = $\frac{4}{12}$ + $\frac{9}{12}$ = $\frac{13}{12}$

    $\frac{-19}{5}$ + $\frac{2}{3}$ – $\frac{11}{3}$ + $\frac{15}{25}$ = $\frac{-19}{5}$ + $\frac{2}{3}$ – $\frac{11}{3}$ + $\frac{3}{5}$ = $\frac{-57}{15}$ + $\frac{10}{15}$ – $\frac{55}{15}$ + $\frac{9}{5}$ = $\frac{-93}{15}$ = $\frac{-31}{5}$

    $\frac{1}{3}$ + $\frac{2}{7}$ + $\frac{-8}{21}$ = $\frac{7}{21}$ + $\frac{6}{21}$ + $\frac{-8}{21}$ = $\frac{5}{21}$

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