` 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

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

=7/10 x 10

= 7

3x7/10+7/10x5+2x7/10

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

=7/10x10

=7

(Dấu . là dấu nhân nha e, tại e mới học lớp 4 nên chưa biết)

\(3.\frac{7}{10}+\frac{7}{10}.5+2.\frac{7}{10}=\frac{7}{10}.\left(3+5+2\right)=\frac{7}{10}.10=7\)

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

Đáp án của mình là: 7

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

= 10 x 7/10

= 7

Chúc bạn học tốt!

= [ 3 + 5 + 2 ] x 7/10

= 10 x 7/10

= 70/10 = 7

(  3 + 5 + 2 ) x 7/10

10 x 7/10 = 70/10

= 7 Mik ko chắc nha.

.

19/20x2/100+19/20x2/100

= [19/20+19/20]x2/100

= 38/20x2/100

= 19/500

75/76x102/100-75/76x2/100

= [102/100-2/100]x75/76

= 1x75/76

= 75/76

3x7/10+7/10x5+2x7/10

= [3+5+2]x7/10

= 10x7/10

= 7

giá trị biểu thức 

2/5+2/3x3/4

= 2/5+1/6

= 17/30

1/2x1/3-1/8

= 1/6-1/8

= 1/24

[1/2+1/3]:3/9

= 5/6:3/9

= 5/2

                       nhớ tick cho tớ nhé

rùi đó

\(a,=5\)

\(b,=\frac{7}{2}\)

\(\left(4+5+1\right)\times\dfrac{7}{10}=10\times\dfrac{7}{10}=\dfrac{70}{10}=7\)

(4+5+1).7/10

=10.7/10

=7

7

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

= 7/10 x 10

=7.

\(3\) x \(\dfrac{7}{10}+\dfrac{7}{10}\) x \(5+2\) x \(\dfrac{7}{10}\)

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

\(=10\) x \(\dfrac{7}{10}=7\)

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

`= 7/10 x 10`

`=7.`

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