\(=\left(\dfrac{3}{7}+\dfrac{8}{14}\right)+\left(\dfrac{3}{10}+\dfrac{7}{10}\right)=1+1=2\)

Mtbrvrvsdqdqd

lx

Uả cái j zị

ảnh đâu 

4x7/10+7/10x5+7/10

= 7/10 x ( 4+5+1)

= 7/10 x 10

= 7

`4xx7/10+7/10xx5+7/10xx1`

`=>(4+5+1)xx7/10`

`=>10xx7/10`

`=>70/10=7`

4 x 7/10 + 7/10x5 + 7/10

=4 x 7/10 + 7/10x5 + 7/10x1

= 7/10 x ( 4+5+1)

= 7/10 x 10

= 7

s

đáp án : 7

\(=\frac{10}{11}-\frac{3}{7}:\frac{7}{15}:\frac{15}{14}\)

\(=\frac{10}{11}-\frac{45}{49}:\frac{15}{14}\)

\(=\frac{10}{11}-\frac{6}{7}=\frac{70}{77}-\frac{66}{77}=\frac{4}{77}\)

A) 5/4 x X = 3/8 + 5/12

5/4 x X = 19/24

        X  = 19/24 : 5/4

        X  = 19/30

vậy x =...

B, 3 x 7/10 + 7/10 x 5 + 2 x 7/10

  = 7/10 x ( 3 + 5 + 2)

  = 7/10 x 10

  = 7

Giúp tớ với mọi người ơi

` 3xx 7/10 + 7/10 xx 5 +2 xx 7/10`

`=7/10 xx (3+5+2)`

`= 7/10 xx 10`

`=7`

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}=\dfrac{7}{10}\times\left(3+5+2\right)=\dfrac{7}{10}\times10=7\)

7

2 nha 

KQ = 2

= 2

+1

=7/10(3+5+2)

=7/10*10

=7

3 x 7/10 + 7/10 x 5 + 2 x 7/10

= 7/10 x (3 + 5 + 2)

= 7/10 x 10

= 7

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)

\(=\dfrac{7}{10}\times\left(3+5+2\right)\)

\(=\dfrac{7}{10}\times10\)

\(=7\)