.
因式分解的方法
(2X+3)(X-5)-(X+1)(X-5)
(2X+3)(X-5)-(X+1)(X-5) = (X-5)[(2X+3)-(X+1)] (利用分配律,提出 X-5) = (X-5)[2X+3-X-1] = (X-5)[X+2] = (X-5)(X+2)
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