计算:(x-3)(3x-4)=_________;
计算:(3a-2)(2a+5)=________;
计算:(a+2b)(a-b)=_________;
填空:x2y·( )=2x3y-x2y2.
已知ab2=-6,求-ab(a2b5-ab3-b)的值.
N是一个单项式,且N·(-2x2y)=-3ax2y2,则N等于( )
A.ay B.-3ay C.-xy D.axy