f(x)=4x/(x^2+1) 怎么求导,..,我是渣渣.,..

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f(x)=4x/(x^2+1)怎么求导,..,我是渣渣.,..f(x)=4x/(x^2+1)怎么求导,..,我是渣渣.,..f(x)=4x/(x^2+1)怎么求导,..,我是渣渣.,..f(x)=4x

f(x)=4x/(x^2+1) 怎么求导,..,我是渣渣.,..
f(x)=4x/(x^2+1) 怎么求导,..,我是渣渣.,..

f(x)=4x/(x^2+1) 怎么求导,..,我是渣渣.,..
f(x)=4x/(x^2+1) 用方式(vdu-udv)/(v^2),V是分母,U是分子.我不知你老师是否用同样的字母代替.
如果你将数字代入公式,就是
f'(x)= [(x^2+1)4 - 4x(2x)dx ]/ (x^2+1)^2
f'(x)= (4x^2 + 4 - 8x^2 dx)/(x^2+1)^2
f'(x)= (-4x^2 + 4)dx/ (x^2+1)^2
f'(x)= [-4(x^2+1)dx]/ (x^2+1)(x^2+1) 将同等项消除掉,就只剩下
f"(x)= -4dx/ (x^2+1)
就这样了.