下图一阶导数求导要具体步骤,感谢!
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y=2x/(x-1)²=2x·(x-1)⁻² 求导
①(u/v)'=(u'v-uv')/v²
y'=[(2x)'·(x-1)²-2x·(x-1)²']/(x-1)⁴
=[2(x-1)²-2x·2(x-1)·(x-1)']/(x-1)⁴
=[2(x-1)²-2x·2(x-1)·1]/(x-1)⁴
=[2(x-1)-2x·2]/(x-1)³
=-(2x+1)/(x-1)³
②(uv)'=u'v+uv'
y'=(2x)'·(x-1)⁻²+2x·[(x-1)⁻²]'
=2·(x-1)⁻²+2x·[-2(x-1)⁻³]
=[2(x-1)-4x]·(x-1)⁻³
=-(2x+1)/(x-1)³
两种方法均可以,结果是一样的
①(u/v)'=(u'v-uv')/v²
y'=[(2x)'·(x-1)²-2x·(x-1)²']/(x-1)⁴
=[2(x-1)²-2x·2(x-1)·(x-1)']/(x-1)⁴
=[2(x-1)²-2x·2(x-1)·1]/(x-1)⁴
=[2(x-1)-2x·2]/(x-1)³
=-(2x+1)/(x-1)³
②(uv)'=u'v+uv'
y'=(2x)'·(x-1)⁻²+2x·[(x-1)⁻²]'
=2·(x-1)⁻²+2x·[-2(x-1)⁻³]
=[2(x-1)-4x]·(x-1)⁻³
=-(2x+1)/(x-1)³
两种方法均可以,结果是一样的
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