设y=x^4,则y'=()
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0605/1591340910531422.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0605/1591340922394326.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0605/1591340935953984.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0605/1591340946260354.png" />
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正确答案: C 答案分析:无
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