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a三次方+3a平方-4因式分解
人气:101 ℃ 时间:2019-08-20 21:28:23
解答
A^3+3A^2-4
=(A^3-A^2)+(4A^2-4)
=A^2(A-1)+4(A^2-1)
=A^2(A-1)+4(A+1)(A-1)
=(A-1)[A^2+4(A+1)]
=(A-1)(A^2+4A+4)
=(A-1)(A+2)^2
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