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x^2-(2k+3)x+k^2+3k+2
人气:254 ℃ 时间:2020-04-10 03:12:43
解答
x^2-(2k+3)x+k^2+3k+2
=x²-(2k+3)x+(k+2)(k+1)
=(x-k-1)(x-k-2)
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