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7(x+y)的3次方+5(x+y)的2次方-2(x+y)用十字相乘法
人气:422 ℃ 时间:2019-12-19 05:58:09
解答
7(x+y)³+5(x+y)²-2(x+y)
=(x+y)[7(x+y)²+5(x+y)-2]
=(x+y)(7x+7y-2)(x+y+1)
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