求导y=(x^2-x+1)/(x^2+x+1)
1个回答
y'=[(2x-1)(x^2+x+1)-(x^2-x+1)(2x+1)]/(x^2+x+1)^2
=(2x^2-2)/(x^2+x+1)^2
=2(x^2-1)/(x^2+x+1)^2
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