Question

Tính bằng cách thuận tiện nhất:

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

Answer 1

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

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

= 7/10 x 10

= 7

Answer 2

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

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

`=>10xx7/10`

`=>70/10=7`

Answer 3

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

Answer 4

=7

Answer 5

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

`= (4+5+1) xx 7/10`

`= 7/10 xx 10`

`= 7`