Question

Выполните действия
1) 5(2-3ху)(2+3ху)
2) (а^3-b^2)^2
3) (x+y)^2-(x-y)^2

Answer 1

5(2-3ху)(2+3ху)=5(4-9x²y²)=20-45x²y²
(а³-b²)²=a⁶-2a³b²+b⁴
(x+y)²-(x-y)²=x²+2xy+y²-(x²-2xy+y²)=x²+2xy+y²-x²+2xy-y²=4xy