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angel00001(Edstrayer´ú·¢): ½ð±Ò+5, rs 2015-11-20 02:34:30
ÓɸߵÈÊýѧ·´º¯ÊýµÄµ¼ÊýµÄ¹«Ê½£ºFai'(y)=dFai(y)/dy= -1/f '(x)=-1/(dy/dx)
Fai "(y)=dFai '(y)/dy=d[-1/(dy/dx)]/dy=-d[1/(dy/dx)]/dx*dx/dy
=f "(x)/[f '(x)]^2*1/(dy/dx)=f "(x)/[f '(x)]^3

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2Â¥2015-11-19 20:36:50
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angel00001

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2Â¥: Originally posted by peterflyer at 2015-11-19 20:36:50
ÓɸߵÈÊýѧ·´º¯ÊýµÄµ¼ÊýµÄ¹«Ê½£ºFai'(y)=dFai(y)/dy= -1/f '(x)=-1/(dy/dx)
Fai "(y)=dFai '(y)/dy=d/dy=-d/dx*dx/dy
=f "(x)/^2*1/(dy/dx)=f "(x)/^3

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