1.Tính a)5/8-2/8 b)11/15-7/15 c)5/7-12/21 d)13/9-28/36 2.Tính a)4/7+3/14 b)1/12+3/2 c)5+3/2 d)4/5+7/3 Phép trừ, cộng phân số ạ!!!

0 bình luận về “1.Tính a)5/8-2/8 b)11/15-7/15 c)5/7-12/21 d)13/9-28/36 2.Tính a)4/7+3/14 b)1/12+3/2 c)5+3/2 d)4/5+7/3 Phép trừ, cộng phân số ạ!!!”

1. 1.

   a,5/8-2/8=3/8

   b,11/15-7/15=4/15

   c,5/7-12/21=1/7

   d,13/9-28/36=2/3

   2.

   a,4/7+3/14=11/14

   b,1/12+3/2=19/12

   c,5+3/2=13/2

   d,4/5+7/3=47/15

             CHO MK CÂU TRẢ LỜI HAY NHẤT NHA!

   Bình luận

2. Bài 1 :

   a, $\frac{5}{8}$ – $\frac{2}{8}$ = $\frac{5-2}{8}$ = $\frac{3}{8}$

   b, $\frac{11}{15}$ – $\frac{7}{15}$ = $\frac{11-7}{15}$ = $\frac{4}{15}$

   c, $\frac{5}{7}$ – $\frac{12}{21}$ = $\frac{15}{21}$ – $\frac{12}{21}$ = $\frac{15-12}{21}$ = $\frac{3}{21}$ = $\frac{1}{7}$

   d, $\frac{13}{9}$ – $\frac{28}{36}$ = $\frac{52}{36}$ – $\frac{28}{36}$ =$\frac{52-28}{36}$ = $\frac{24}{36}$ = $\frac{2}{3}$

   Bài 2 :

   a, $\frac{4}{7}$ + $\frac{3}{14}$ = $\frac{8}{14}$ + $\frac{3}{14}$ = $\frac{8+3}{14}$= $\frac{11}{14}$

   b, $\frac{1}{12}$ + $\frac{3}{2}$ = $\frac{1}{12}$ + $\frac{18}{12}$ = $\frac{1+18}{12}$ = $\frac{19}{12}$

   c, 5 +  $\frac{3}{2}$ = $\frac{5}{1}$ + $\frac{3}{2}$ = $\frac{10}{2}$ + $\frac{3}{2}$ = $\frac{10+3}{2}$ = $\frac{13}{2}$

   d, $\frac{4}{5}$ + $\frac{7}{3}$ = $\frac{12}{15}$ + $\frac{35}{15}$ = $\frac{12+35}{15}$ = $\frac{47}{15}$

    

   Bình luận