与导数相关的题目,只做第一问即可
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与导数相关的题目,只做第一问即可
![](http://img.wesiedu.com/upload/5/29/52989b70b6b1259b522df1902718e4f7.jpg)
![](http://img.wesiedu.com/upload/5/29/52989b70b6b1259b522df1902718e4f7.jpg)
![与导数相关的题目,只做第一问即可](/uploads/image/z/17531337-57-7.jpg?t=%E4%B8%8E%E5%AF%BC%E6%95%B0%E7%9B%B8%E5%85%B3%E7%9A%84%E9%A2%98%E7%9B%AE%2C%E5%8F%AA%E5%81%9A%E7%AC%AC%E4%B8%80%E9%97%AE%E5%8D%B3%E5%8F%AF)
f(1) = 16a
点为(1,16a);
f'(x) = 2a(x-5) + 6/x
f'(1) = 6 - 8a
切线:
y - 16a = (6 - 8a)(x-1)
与y轴交于(0,6);
即当x=0时,
y = 24a - 6
= 6
a=1/2
点为(1,16a);
f'(x) = 2a(x-5) + 6/x
f'(1) = 6 - 8a
切线:
y - 16a = (6 - 8a)(x-1)
与y轴交于(0,6);
即当x=0时,
y = 24a - 6
= 6
a=1/2