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

5( 2^2 - (3ху)^2) = 5(4 - 9х^2у^2) = 20 - 45х^2у^2;(а^3)^2 - 2 * а^3 * b^2 + (b^2)^2 = a^6 - 2a^3b^2 + b^4;((x + y) - (x - y))((x + y) + (x - y)) = (x + y - x + y)(x + y + x - y) = ((x - x) + (y + y))((x + x) + (y - y)) = (0x + 2y)(2x + 0y) = 2y * 2x = 4xy.