Question

Раскрой скопки
2) (y+9)*7
12(3-n)
5(a+8)

3) 6(a+b-5)
8(5+m-n)
(x-y+6)*10

Answer 1

2.
(у+9)7 = 7у + 63
12(3-n) = 36-3n
5(a+8) = 5a+40

3.
6(a+b-5) = 6a+6b-30
8(5+m-n) = 40+8m-8n
(x-y+6)10= 10x-10y+60