3(x-2)的三次方-81

问题描述:

3(x-2)的三次方-81
gfffffffffffffffff

3(x-2)的三次方-81
=3[(x-2)³-27]
=3(x-2-3)((x-2)²+3(x-2)+9)
=3(x-5)(x²-4x+4+3x-6+9)
=3(x-5)(x²-x+7)
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