Question

решитееееееее, 7 класс​

Answer 1

(a-b)²-a²= (a-b-a)×(a-b+a)=-b×(2a-b)

x³+y³+2xy×(x+y)=

= (x+y)×(x²-xy+y²)+2xy×(x+y)=

=(x+y)×(x²-xy+y²+2xy) =(x+y)×(x²+xy+y²)