Question

xy=-4
x-y=9
x³-y³=?
Срочно!!!

Answer 1

Ответ:

x^3-y^3=(x-y)(x^2+xy+y^2)=(x-y)((x-y)^2+3xy)=9*(9^2+3*-4)=9*(81-12)=9*69=621