Question

Tính nhanh 
( 12/26 +5/8 ) +7/13 

Answer 1

(12/26+5/8)+7/13

=(12/26+7/13)+5/8

=1+5/8=8/8+5/8=13/8

Answer 2

6/13 + 5/8 + 7/13

= 6/13 + 7/13 + 5/8

= 1 + 5/8 = 1/5/8 

Answer 3

(12/26+5/8)+7/13

1+5/8 =13/8

Ai ủng hộ cho cái Li-Ke đi mà