c²(c+2)-c-2 因式分解 答案是(c+2)(c-1)(c+1)
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c²(c+2)-c-2 因式分解 答案是(c+2)(c-1)(c+1)
c²(c+2)-c-2 因式分解 答案是(c+2)(c-1)(c+1)
c²(c+2)-c-2 因式分解 答案是(c+2)(c-1)(c+1)
c²(c+2)-c-2
=c²(c+2)-(c+2 )提取公因式
=(c+2)(c²-1)平方差
=(c+2)(c-1)(c+1)
c²(c+2)-c-2
=c²(c+2)-(c+2)
=(c+2)(c^2-1)
=(c+2)(c-1)(c+1)