x的四次方-3x的平方+9因式分解,急
如题,急
人气:174 ℃ 时间:2019-09-01 05:05:00
解答
x^4-3x^2+9
=x^4+6x^2+9-9x^2
=(x^2+3)^2-9x^2
=(x^2+3x+3)(x^2-3x+3)
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