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数学
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求下列函数的微分 e^x+y-xy^2=1
人气:441 ℃ 时间:2020-04-19 12:11:26
解答
有两种方法:
(1)e^x+y-xy²=1
→e^x+y'-(y²+2xy·y')=0
→y'=(e^x-y²)/(2xy-1)
∴dy=[(e^x-y²)/(2xy-1)]dx.
(2)设F=e^x+y-xy²-1,则
F'x=e^x-y²,F'y=1-2xy.
∴dy/dx=F'=-F'x/F'y
=(e^x-y²)/(2xy-1)
∴dy=[(e^x-y²)/(2xy-1)]dx.貌似答错了吧!第二方法你可能看不懂,两种方法都没错你!可是答案不对啊。
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