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问题: 分解因式:x^2+(x+1)^2+[x(x+1)]^2

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解答:

 x^2 + (x+1)^2 + [x(x+1)]^2
= (x+1)^2 - 2x(x+1) + x^2 + [x(x+1)]^2 + 2x(x+1)
= (x+1-x)^2 + [x(x+1)]^2 + 2x(x+1)
= [x(x+1)]^2 + 2x(x+1) + 1
= [x(x+1) + 1]^2
= (x^2 + x + 1)^2