mong mọi người là giúp cho mình ạ

\(\dfrac{4}{5}\times\left(\dfrac{5}{4}-\dfrac{5}{7}\right)\)

\(=\dfrac{4}{5}\times\left(\dfrac{35}{28}-\dfrac{20}{28}\right)\)

\(=\dfrac{4}{5}\times\dfrac{15}{28}\)

\(=\dfrac{3}{7}\)

__

\(\dfrac{5}{8}\times\dfrac{9}{7}+\dfrac{5}{8}\times\dfrac{5}{7}\)

\(=\dfrac{5}{8}\times\left(\dfrac{9}{7}+\dfrac{5}{7}\right)\)

\(=\dfrac{5}{8}\times2=\dfrac{10}{8}=\dfrac{5}{4}\)

\(\dfrac{117}{171}=\dfrac{117:9}{171:9}=\dfrac{13}{19}\)

`2/3 + 5/4 + 2/3 xx 4/5 = 2/3 xx (5/4+4/5)`

2 phần 3 nhé

`(1/3 + 1/5) xx 1/4`

`= ( 5/15 + 3/15) xx 1/4`

`= 8/15 xx 1/4`

`= 8/60`

`= 2/15`

__

`(1/3 + 1/5) xx 1/4`

`= 1/3 xx 1/4 + 1/5 xx 1/4`

`= 1/12 +1/20`

`=2/15`

\(C_1:\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\times\dfrac{1}{4}=\dfrac{1}{4}\times\dfrac{1}{3}+\dfrac{1}{4}\times\dfrac{1}{5}=\dfrac{1}{12}+\dfrac{1}{20}=\dfrac{2}{15}\)

\(C_2:\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\times\dfrac{1}{4}=\dfrac{8}{15}\times\dfrac{1}{4}=\dfrac{8\times1}{15\times4}=\dfrac{8}{60}=\dfrac{2}{15}\)

Chiều rộng hcn là :

\(\dfrac{6}{7}-\dfrac{2}{3}=\dfrac{4}{21}\left(m\right)\)

Diện tích hình chữ nhật là :

\(\dfrac{4}{21}\times\dfrac{6}{7}=\dfrac{8}{49}\left(m^2\right)\)

mình cảm ơn

4200

4500

`7)`

`2/5+3/8`

`=16/40+15/40`

`=31/40`

__

`8/9xx7/5`

`=(8xx7)/(9xx5)`

`=56/45`

\(\dfrac{2}{5}+\dfrac{3}{8}=\dfrac{16+15}{40}=\dfrac{31}{40}\)

\(\dfrac{8}{9}\times\dfrac{7}{5}=\dfrac{8\times7}{9\times5}=\dfrac{56}{45}\)

a. 5/6+1/3*2

= 5/6+2/3

= 5/6+4/6

= 10/6

= 5/3

`a, 5/6 + 1/3 xx 2`

`= 5/6 + 2/3`

`= 5/6 + 4/6`

`=9/6`

`=3/2`

`b, 9/11 : (6/7 - 5/6)`

`= 9/11 : ( 36/42 - 35/42)`

`= 9/11 : 1/42`

`=9/11 xx42`

`=378/11`

1D

2B

3D

4C

mình cảm ơn nhé