计算:(4x2-2xy+y2)(2x+y).
计算:(3x-y)(x+2y)=________.
计算:(x-3)(3x-4)=_________;
计算:(3a-2)(2a+5)=________;
计算:(a+2b)(a-b)=_________;
填空:x2y·( )=2x3y-x2y2.