计算（-2x﹚²·﹙-1/2xy²﹚³·4y

计算（-2x﹚²·﹙-1/2xy²﹚³·4y
计算（-2x﹚²·﹙-1/2xy²﹚³·4y

计算（-2x﹚²·﹙-1/2xy²﹚³·4y
（-2x﹚²·﹙-1/2xy²﹚³·4y
=4x²·﹙-1/8x³y的6次方﹚·4y
=-2x的5次方y的7次方
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