求一个函数的导数
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除了可以运用两个函数商的求导法则计算外,还可如下简算:
[2(1-x)/(x+1)³]'
=-2[(x-1)/(x+1)³]'
=-2[(x+1-2)/(x+1)³]'
=-2[1/(x+1)²-2/(x+1)³]'
=-2[-2/(x+1)³+6/(x+1)^4]
=4[1/(x+1)³-3/(x+1)^4]
=4(x-2)/(x+1)^4.
[2(1-x)/(x+1)³]'
=-2[(x-1)/(x+1)³]'
=-2[(x+1-2)/(x+1)³]'
=-2[1/(x+1)²-2/(x+1)³]'
=-2[-2/(x+1)³+6/(x+1)^4]
=4[1/(x+1)³-3/(x+1)^4]
=4(x-2)/(x+1)^4.
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