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因式分解 3(y-2)2-(2y-z)(-z+2y)
还有【x(x²y²-xy)-y(x²-x³y)】除以3x²y
人气:459 ℃ 时间:2020-09-23 23:17:03
解答
【x(x²y²-xy)-y(x²-x³y)】除以3x²y
=[x²y(xy-1)+x²y(xy-1)]/3x²y
=2(xy-1)/3
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