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(-x的平方+2x+15)÷(x+3)
人气:397 ℃ 时间:2020-05-27 23:38:35
解答
(-x的平方+2x+15)÷(x+3)
=-(x²-2x-15)÷(x+3)
=-(x-5)(x+3)÷(x+3)
=-(x-5)
=-x+5
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