f(x^2-y^2,x-y)=x+y+x^2-xy,求f'(x,y)对y求导
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f(x^2-y^2,x-y)=x+y+x^2-xy,求f''(x,y)对y求导f(x^2-y^2,x-y)=x+y+x^2-xy,求f''(x,y)对y求导f(x^2-y^2,x-y)=x+y+x^2-x
f(x^2-y^2,x-y)=x+y+x^2-xy,求f'(x,y)对y求导
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设x-y=a,x+y=b／a ,x=b／a+a 则原方程变为f（b,a）=b／a+﹙b／a+a﹚a
在这里a,b和xy的地位相同,所以f﹙x,y﹚=x／y+﹙x／y+y)y知道了函数,那求导就简单多了,不用我再做老了吧
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