求达人解四道函数题1.f(x)=4ln(6x+5ln(x)) f'(x)=?f'(4)=?2.f(x)=4ln(ln(x)) f'(x)=?3.y=2^x+13/x^6 f'(x)=?4.f(x)=ln((2x+9)/(7x-5))^(1/2) f'(x)=?如方便,请附上解题步骤,感激不尽!
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![求达人解四道函数题1.f(x)=4ln(6x+5ln(x)) f'(x)=?f'(4)=?2.f(x)=4ln(ln(x)) f'(x)=?3.y=2^x+13/x^6 f'(x)=?4.f(x)=ln((2x+9)/(7x-5))^(1/2) f'(x)=?如方便,请附上解题步骤,感激不尽!](/uploads/image/z/7807907-11-7.jpg?t=%E6%B1%82%E8%BE%BE%E4%BA%BA%E8%A7%A3%E5%9B%9B%E9%81%93%E5%87%BD%E6%95%B0%E9%A2%981.f%28x%29%3D4ln%286x%2B5ln%28x%29%29+f%27%28x%29%3D%3Ff%27%284%29%3D%3F2.f%28x%29%3D4ln%28ln%28x%29%29+f%27%28x%29%3D%3F3.y%3D2%5Ex%2B13%2Fx%5E6+f%27%28x%29%3D%3F4.f%28x%29%3Dln%28%282x%2B9%29%2F%287x-5%29%29%5E%281%2F2%29+f%27%28x%29%3D%3F%E5%A6%82%E6%96%B9%E4%BE%BF%2C%E8%AF%B7%E9%99%84%E4%B8%8A%E8%A7%A3%E9%A2%98%E6%AD%A5%E9%AA%A4%2C%E6%84%9F%E6%BF%80%E4%B8%8D%E5%B0%BD%21)
求达人解四道函数题1.f(x)=4ln(6x+5ln(x)) f'(x)=?f'(4)=?2.f(x)=4ln(ln(x)) f'(x)=?3.y=2^x+13/x^6 f'(x)=?4.f(x)=ln((2x+9)/(7x-5))^(1/2) f'(x)=?如方便,请附上解题步骤,感激不尽!
求达人解四道函数题
1.f(x)=4ln(6x+5ln(x)) f'(x)=?f'(4)=?
2.f(x)=4ln(ln(x)) f'(x)=?
3.y=2^x+13/x^6 f'(x)=?
4.f(x)=ln((2x+9)/(7x-5))^(1/2) f'(x)=?
如方便,请附上解题步骤,感激不尽!
求达人解四道函数题1.f(x)=4ln(6x+5ln(x)) f'(x)=?f'(4)=?2.f(x)=4ln(ln(x)) f'(x)=?3.y=2^x+13/x^6 f'(x)=?4.f(x)=ln((2x+9)/(7x-5))^(1/2) f'(x)=?如方便,请附上解题步骤,感激不尽!
首先要知道(lnx)'=1/x,然后一步一步求
1. f'(x)=4*[1/(6x+5lnx)]*(6+5/x),f'(4)就把x=4带入
2. f'(x)=4*(1/lnx)*(1/x)
(a^x)'=lna * a^x, (x^a)'=ax^(a-1)
3. f'(x)=ln2*2^x+13*6x^(-7)
4. f'(x)=[(7x-5)/(2x+9)]^(1/2)*(1/2)[(2x+9)/(7x-5)]^(-1/2)*{[2(7x-5)-7(2x+9)]/(7x-5)^2},整理就不写了
1)f'(x)=4*1/(6x+5lnx)*(6+5/x) f'(4)=29/(24+5ln4)
2)f'(x)=4/lnx*1/x
3)f'(x)=2^x*ln2-13*7/x^7
4)f'(x)=[1/(2x+9)*2-1/2*(7x-5)^(-1/2)*7]/(7x-5)
你知道复合函数如何求到数吗? 链式法则(chain rule) 若h(x)=f(g(x))
则h'(x)=f'(g(x))g'(x) ,利用这个公式去求解!
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