函数y=x^n在x=2时的导数为12,则n=
人气:153 ℃ 时间:2019-11-15 21:09:56
解答
y=x^n
dy=nx^(n-1)
x=2时的导数为12,即x=2时dy=12
即12=n2^(n-1)
所以n=3
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