Question

Упростите выражение (y^2+6y)2-y^2(6+5y)(6-5y)-y^2(12y-y^2)

Answer 1

=y*2((y+6)*2-(36-25y*2)-(12y-y*2))= y*2(y*2+12y+36-36+25y*2-12y+y*2)= y*2(27y*2)=(3y)*3