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X的立方+3乘以X的平方-4
人气:296 ℃ 时间:2020-01-24 13:46:24
解答
x³+3x²-4
=x³+3x²-4x+4x-4
=x(x²+3x-4)+4(x-1)
=x(x-1)(x+4)+4(x-1)
=(x-1)(x²+4x+4)
=(x-1)(x+2)²
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