Question

Bài 12: Tính bằng cách thuận tiện:

a/ 4/5 x2/7 +4/5 x5/7 =

Answer 1

= 4/5 x (2/7 + 5/7)

= 4/5 x 1

= 4/5

Answer 2

= 4/5

Answer 3

( 4/5 + 4/5 ) x ( 2/7 + 5/7 )

=    8/5        x          1

=      8/5

Answer 4

\(\dfrac{4}{5}\times\dfrac{2}{7}+\dfrac{4}{5}\times\dfrac{5}{7}=\dfrac{4}{5}\times\left(\dfrac{2}{7}+\dfrac{5}{7}\right)=\dfrac{4}{5}\times1=\dfrac{4}{5}\)

Answer 5

bằng 4/5 nha bạn

Answer 6

4/5

Answer 7

4/5 x 2/7 + 4/5 x 5/7

=> 4/5 x (2/7 + 5/7)

=> 4/5 x 1

=> 4/5

Answer 8

= 4/5

Answer 9

4/5

Answer 10

4/5