x+2)(x+4)+x的二次方-4 分解因式

2025-12-14 13:32:22
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回答1:

(x+2)(x+4)+x的二次方-4
=(x+2)(x+4)+(x-2)(x+2)
=(x+2)[(x+4)+(x-2)]
=(x+2)(x+4+x-2)
=(x+2)(2x+2)
=2(x+2)(x+1)