Question

3(a-b)-2(a+b) и 4(x+y)+5(2x-y)

Answer 1

1) 3•(а-b)-2•(a+b)=3а-3b-2a-2b=a-5b

2) 4•(x+y)+5•(2x-y)=4x+4y+10x-5y=14x-y