高数，如图，请懂符合函数求导的进
\u9ad8\u7b49\u6570\u5b66\uff0c\u591a\u5143\u51fd\u6570\u6c42\u5bfc\uff0c\u5982\u56fe\uff0c\u6c42\u628a\u8fd9\u9053\u6c42\u591a\u5143\u590d\u5408\u9690\u51fd\u6570\u7684\u6c42\u5bfc\u8fc7\u7a0b\u8be6\u7ec6\u5199\u4e00\u4e0b\u3002\u81ea\u52a8\u5ffd\u7565\u6211\u5199\u7684\u4e1c\u897f\u3002\u3002\u628ay\uff1df(x,t)\u4e0eF(x,y,t)=0\u8054\u7acb\uff0c\u8fd9\u662f\u542b\u6709\u4e09\u4e2a\u53d8\u91cfx,y,t\u7684\u4e8c\u4e2a\u65b9\u7a0b\u7ec4\u6210\u7684\u65b9\u7a0b\u7ec4\uff0c\u7531\u6b64\u53ef\u786e\u5b9a\u4e24\u4e2a\u4e00\u5143\u9690\u51fd\u6570y\uff1dy(x)\uff0ct\uff1dt(x)\u3002
\u8bbeG(x,y)=f(x,t)-y\uff0c\u5957\u516c\u5f0f\uff0c\u5f97
Ux=3ax^2+by^2+dyz=0 \u3010\u5bf9x\u6c42\u5bfc\u3011
Uy=2bxy+dxz=0
Uz=2cz+dxy=0
\u89e3\u51faxyz,\u518d\u5224\u65ad\u662f\u4e0d\u662f\u6781\u503c
\u8fd9\u91cc\u90fd\u662f\u5b57\u6bcd\uff0c\u65e0\u6cd5\u8ba1\u7b97\u3002
很容易求，参看隐函数这一章。
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