填空:1.(-2a)²·(-9a²b³)=_______2.(3/4x²y-5zyz²)·(-3/5xy²z)=________3.(-9ab)·(1/3ab+1/6a-1)=__________4.(-3/4x²y-2/3xy²-5/6y³)·(-12xy)=____________5.[-(a²b)²]³·(
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