计算:x?2x2?3x3?4x4?5x5?6x6
= ;= .
计算:(﹣2xy2)2?3x2y?(﹣x3y4)= .
3y2?(﹣y)3= .
计算:(﹣2x2y)?(﹣3x2y3)= .
计算:2a2?(﹣4ab)= .