如果的乘积中不含项,则为________.
计算:(1)=_________.(2)=_________.
计算:xy2·(-x2)=_________.
计算:(-2xy)(3x2y-2x+1)=_________.
在x+p与x2-2x+1的积中不含x,则p的值为_________.
计算:-3xy2z·(x2y)2=_________.