整式的乘法题目4x²y·（-xy²）³+6x²·3x³y^7=_____[2ab²·（-3ab）]²=_____（-2x²y³）²·（-3xy²）=_____x^m·(x^(n-1)-x^m-1)=_____3x(x²-2x-1)-x²（x-2)=_____(x-3)(x-3)-6(x²
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