已知a、b为两个连续整数,且a<<b,则=____.
计算:(x-3)(3x-4)=_________;
计算:(3a-2)(2a+5)=________;
计算:(a+2b)(a-b)=_________;
填空:x2y·( )=2x3y-x2y2.
计算:3x2y(-4xy2)·(x3)2=_________.