Question

Упростите выражение :3x(x+y+c)-3y(x-y-c)-3c(x+y-c)

Answer 1

3x(x+y+c)-3y(x-y-c)-3c(x+y-c)=3x^2+3xy+3xc-3xy+3y^2+3yc-3cx+3cy+3c^2=