计算 ①[x(x²y²-xy)-y(x²-x³y)]÷3x²y
1个回答
这个题思路是 你直接一个一个除掉 他会简化的
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
=1/3 xy -1/3-1/3+1/3 xy
=2xy/3-2/3
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(x²y³+xy)(x²y³-xy)÷x²y³,其中x=3,