计算:(1)(-2x2y)2?(-3xy).(2)(-23a2b)?(56ac2).(3)(-12x2y)3?3xy2?(2xy2)2.(4)-6m2n

计算:(1)(-2x2y)2?(-3xy).(2)(-23a2b)?(56ac2).(3)(-12x2y)3?3xy2?(2xy2)2.(4)-6m2n?(x-y)3?13mn2(y-x)2.

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