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(x-y)d(ln(x-y))为什么等于dx-dy?看不懂T^T!
人气:250 ℃ 时间:2020-05-30 15:00:11
解答
(x-y)d(ln(x-y))
=(x-y)*1/(x-y)*d(x-y)
=d(x-y)
=dx-dy
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