用a/b=In a-In b证明计算用a/b=In a-In b,证明,如果y=In(1+x/1-x)这个式子.(2x/1-x^2)dy/dx-d^2y/dx^2=0
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用a/b=In a-In b证明计算用a/b=In a-In b,证明,如果y=In(1+x/1-x)这个式子.(2x/1-x^2)dy/dx-d^2y/dx^2=0
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