已知y=x/lnx,求y7及y”.
y'=[(x')•lnx-x•(lnx)']/ln2x=(lnx-1)/ln2x=1/lnx-1/ln2xy”=(1/lnx)'-(1/ln2x)'=-(1/ln2x)•(lnx)'+(2/ln3x)(lnx)'=-(1/xln2x)+2/xln3x.
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