Question

tính nhanh 
2/19 x 3/7 + 3/7 x 4/19 + 13/19 x 3/7 

giúp mink

Answer 1

2/19 x 3/7 + 3/7 x 4/19 + 13/19 x 3/7 

= ( 2/19 + 4/19 + 13/19) x 3/7

= 19/19  x 3/7

= 1 x 3/7

= 3/7

Answer 2

=3/7.(2/19+4/19+13/19)

=3/7.1

=3/7

Answer 3

`2/19 xx 3/7 + 3/7 xx 4/19 + 13/19 xx 3/7`

`= ( 2/19 + 4/19 + 13/19) xx 3/7`

`= 19/19  xx 3/7`

`= 1 xx 3/7`

`= 3/7`

Answer 4

=3/7(2/19+4/19+13/19)=3/7

Answer 5

`2/19 x 3/7 + 3/7 x 4/19 + 13/19 x 3/7 `

`= ( 2/19 + 4/19 + 13/19) x 3/7`

`= 19/19  x 3/7`

`= 1 x 3/7`

`= 3/7`

Answer 6

= (2/19 + 4/19 + 13/19) × 3/7

= 1 × 3/7

= 3/7