Question

8 / 15 x 5/ 9 + 5/ 9 x 7 / 15

Answer 1

TINH NHANH

Answer 2

= 5/9 x (8/15 + 7/15)

= 5/9 x 1

= 5/9

Answer 3

= (8/15+7/15) x 5/9

= 15/14 x 5/8

= 1 x 5/9

= 5/9

Answer 4

5/9

Answer 5

5/9

Answer 6

\(\dfrac{8}{15}\times\dfrac{5}{9}+\dfrac{5}{9}\times\dfrac{7}{15}\)

\(\dfrac{8}{15}+\dfrac{7}{15}\times\left(\dfrac{5}{9}\right)\)

\(=1\times\dfrac{5}{9}=\dfrac{5}{9}\)

Answer 7

= (8/15+7/15) x 5/9

= 15/15 x 5/8

= 1 x 5/9

= 5/9