Question

!!!!1!!!!!2!!!!3!!!!4

Answer 1

a) a+b+c(a+b)=(a+b)+c(a+b)=(a+b)(1+c)
б) (x+y)²+(x+y)=(x+y)(x+y+1)
в) x+2a(x-y)-y=(x-y)+2a(x-y)=(x-y)(1+2a)
г) x²-y²+x+y=(x-y)(x+y)+(x+y)=(x+y)(x-y+1)