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问题: 因式分解

(x+1)(x+2)(x+3)(x+4)-48

解答:

(x+1)(x+2)(x+3)(x+4)-48
=(x+1)(x+4)(x+2)(x+3)-48
=(x^2+5x+4)(x^2+5x+6)-48
=(x^2+5x)^2+10x-24
=(x^2+5x+12)(x^2+5x-2)