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3(x^2-1)^2+18(1-x^2)+27
3(x²-1)²+18(1-x²)+27
人气:425 ℃ 时间:2020-02-04 13:23:03
解答
原式=3(x²-1)²-18(x²-1)+27
=3[(x²-1)²-6(x²-1)+9]
=3(x²-1-3)²
=3(x²-4)²
=3(x+2)²(x-2)²
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