6c^2- 9c - 6c^2 -9c
= ______________ = _____;
3+2c 3+2c
4y - 2y - 2x 2(y-x) 2
= ______________ = _______= _______;
y^2 - x^2 (y-x)(y+x) y+x
a^3+a^2*b+a*b^2+b^3+2a^2*b+2a*b^2 a^3+3a^2*b+3a*b^2+b^3
= ________________________________ = ____________________;
2a(a+b)^2 2a(a+b)^2
(a+b)^3 a+b
=_________= ______
2a(a+b)^2 2a
как то так