III. Mustaqil yechish uchun masalalar
Quyidagi tenglamalarning umumiy yechimlarini tоping:
1) Ux=1;
2) Uyy=6y;
3) Uxy=1;
4) Uxxyy=0;
5) 2Uxx–5Uxy+3Uyy=0;
6) 2Uxx+6Uxy+4Uyy+Ux+Uy=0;
7) 3Uxx–10Uxy+3Uyy–2Ux+4Uy+ U=0;
8) Uyy–2Uxy+2Ux–Uy=4ex;
9) Uxx–2 sin x Uxy–cos2 xUyy–cos xUy=0;
10) xUxx–yUyy+ (Ux–Uy)=0 (x>0; y>0);
11) x2Uxx–y2Uyy–2yUy=0;
12) x2Uxx–2xyUxy+y2Uyy+xUx+yUy=0.
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