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数学
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f(x)=(ax)/(x^2+b) 的导数怎么求?
人气:497 ℃ 时间:2020-09-09 17:16:16
解答
f(x)=(ax)/(x^2+b)
则
f'(x)=[a(x²+b)-ax(2x)]/(x²+b)²
=(ax²-2ax²+ab)/(x²+b)²
=(ab-ax²)/(x^4+2bx²+b²)
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