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问题: 分解因式:x(x+1)(x+2)(x+3)+1

分解因式:x(x+1)(x+2)(x+3)+1

解答:

x(x+1)(x+2)(x+3)+1
=x(x+3)(x+1)(x+2)+1
=(x*x+3x+1-1)(x*x+3x+1+1)+1
=(x*x+3x+1)^2