导函数求导
y = 4x^2 导函数怎么求?
1、y' = 4 * 2x = 8x
2、y' = (2x)^2 = 2 * 2x = 4x
这两种方法谁是正确的,错的又错在哪里?
人气：411 ℃ 时间：2020-04-04 09:24:44
解答
1对的,2的话还有个U求导的没乘上
2、y' = (2x)^2 = 2 * 2x = 4x
u=2x,dy/dx=dy/du*du/dx=2*2x*2=8x
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