X^3-6X^2-8X+A,A=13
分解因式
人气：400 ℃ 时间：2020-09-09 01:50:40
解答
原式=X³-6X²+5X-13X+13
=X(X²-6X+5)-13(X-1)
=X(X-1)(X-5)-13(X-1)
=(X-1)[X(X-5)-13]
=(X-1)(X²-5X-13)
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