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(a)
y = 3x/[(x+2)(x+4)]
lny =ln3x -ln(x+2)-ln(x+4)
(1/y).dy/dx = 1/x - 1/(x+2) -1/(x+4)
dy/dx = [1/x - 1/(x+2) -1/(x+4)] .[3x/[(x+2)(x+4)]]
(b)
y=(x^2+3).e^(x^2+1)
lny =ln(x^2+3) + (x^2+1)
(1/y).dy/dx =2x/(x^2+3) + 2x
dy/dx =[2x/(x^2+3) + 2x].[(x^2+3).e^(x^2+1)]
y = 3x/[(x+2)(x+4)]
lny =ln3x -ln(x+2)-ln(x+4)
(1/y).dy/dx = 1/x - 1/(x+2) -1/(x+4)
dy/dx = [1/x - 1/(x+2) -1/(x+4)] .[3x/[(x+2)(x+4)]]
(b)
y=(x^2+3).e^(x^2+1)
lny =ln(x^2+3) + (x^2+1)
(1/y).dy/dx =2x/(x^2+3) + 2x
dy/dx =[2x/(x^2+3) + 2x].[(x^2+3).e^(x^2+1)]
追问
不好意思 可以麻烦你用纸帮我写一下么 这样看不太清
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