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sinxy-ln(x+y)=0两边对X求导 cos(xy)(y+xy')-(1+y‘)/(x+y)=0 其中(1+y‘)/(x+y)怎么得来的?
人气:338 ℃ 时间:2019-12-01 13:04:24
解答
ln(x+y)求导=1/(x+y)*(x+y)'
=1/(x+y)*(1+y')
=(1+y')/(x+y)
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