Question

Tính nhanh:

\(\dfrac{12}{13}+\dfrac{2}{7}+\dfrac{8}{13}+\dfrac{6}{13}+\dfrac{5}{7}\)

Answer 1

\(\dfrac{12}{13}+\dfrac{2}{7}+\dfrac{8}{13}+\dfrac{6}{13}+\dfrac{5}{7}\)
\(=\left(\dfrac{12}{13}+\dfrac{8}{13}+\dfrac{6}{13}\right)+\left(\dfrac{2}{7}+\dfrac{5}{7}\right)\)
\(=2+1\)
\(=3\)

Answer 2

= ( 12/13 + 8/13 + 6/13 ) + ( 2/7 + 5/7 )

= 26/13 + 7/7

= 2 + 1

= 3

 

Answer 3

cảm ơn bạn đã giải 3 bài giúp mình!

Answer 4

Nam Casper