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X的Y次方等于Y的X次方,求Y导数.
人气:260 ℃ 时间:2019-09-24 06:13:24
解答
X^Y = Y^X
YlnX = XlnY
lnX·dY + Y/X·dX = lnY·dX + X/Y·dY
(lnX - X/Y)dY = (lnY - Y/X)dX
dY/dX = (lnY - Y/X)/(lnX - X/Y)
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