Question

Выполните действия:
1)3(4-5xy)(4+5xy)
2)(x^2-y^3)^2
3)(c+m)^2-(c-m)^2

Answer 1

1)3(4-5xy)(4+5xy)
(12-15xy)(4+5xy)
48+60xy-60xy-75x^2y^2
-75x^2y^2+48
2)(x^2-y^3)^2
x^4+y^6

(c+m)^2-(c-m)^2
c^2+2mc+m^2-c^2+2mc-m^2
4mc