Tolong dibantu ya :)

A) [4×2/7] + [4×5/7]
= 8/7+20/7
= 28/7
= 4

B) [2/5×9] + [4/5×6]
= 18/5 + 24/5
= 42/5
= 8 2/5 (delapan duaperlima)

C) [7×2/9] - [5×4/9]
= 14/9 - 20/9
= -6/9
= -2/3

D) [3/7×9] - [3/7×12]
= 27/7 - 36/7
= -9/7

Menurut saya jawabannya seperti ini, maaf kalau salah