Question

 выполните действия:

3(1+2xy)(1-2xy);

(x^2-y^3)^2;

(a+b)^2-(a-b)^2;

Answer 1

1) 3(1+2ху)(1-2ху)=3(1-4х^2y^2)=3-12x^2y^2

2)(x^2-y^3)^2=x^4-2x^2y^3+y^6

3)(a+b)^2-(a-b)^2=a^2+2ab+b^2-a^2+2ab-b^2=4ab