问题标题:
【关于导数数学题Ifthelinetangenttothegraphofthefunctionfatthepoint(1,7)passesthroughthepoint(-2,-2)thenf'(1)is()A.-5B.1C.3D.7E.undefined】
问题描述:
关于导数数学题
Ifthelinetangenttothegraphofthefunctionfatthepoint(1,7)passesthroughthepoint(-2,-2)thenf'(1)is()
A.-5B.1C.3D.7E.undefined
马翠回答:
在(1,7)点的切线经过点(-2,-2)
切线斜率k=(-2-7)/(-2-1)=3
所以函数在(1,7)点的导数值为3
于是f'(1)=3
选C
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