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x³-5x²y²-xy-y³-()=2x³+y² 请问这题这么做?
人气:395 ℃ 时间:2020-02-05 23:26:48
解答
x³-5x²y²-xy-y³-()=2x³+y²
()=x³-5x²y²-xy-y³-(2x³+y²)
=-x³-5x²y²-xy-y³-y²
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