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微分方程x+y+(y-x)y′=0的通解是()
A.arctan y/x+1/21n(x²+y²)=C
B.arctan y/x-1n(x²+y²)=C
C.arctan y/x+1n(x²+y²)=C
D.arctan y/x-1/21n(x²+y²)=C
A.arctan y/x+1/21n(x²+y²)=C
B.arctan y/x-1n(x²+y²)=C
C.arctan y/x+1n(x²+y²)=C
D.arctan y/x-1/21n(x²+y²)=C
参考答案