计算:①3xy·4y² ②-2xy·3xy²
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计算:①3xy·4y² ②-2xy·3xy²
=12xy^(1+2)
=12xy^3
=-6x^(1+1)y^(1+2)
=-6x^2y^3
=12xy^3
=-6x^(1+1)y^(1+2)
=-6x^2y^3
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
【回答后给分】【初一下】计算:①(4xy)·(-2xy³) ②(-xy²z³)²
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