Question

2/5+7/12+13/12= Tính bằng cách thuận tiện nhất

Answer 1

= 2/5 +(7/12 + 13/12)

=2/5 + 20/12

=   31/15

Answer 2

Giống Nguyễn thị sương quỳnh

Answer 3

7/13 < 13/ < 7/12

Answer 4

2/5+7/12+13/12=2/5+(7/12+13/12)=2/5+7/12=49/15

Answer 5

7/4 + 5/12 +9/4 + 7/12

TINH THUAN TIEN 

Answer 6

2/5 + 13/12 +11/12 +3/5