решить системы уравнений:
a)
xy+x+y=11;
x^2y+xy^2=30; 

б)
x^2-2xy=3;
3x^2-2y^2=1;
в)
x-2y+3:(x-2y)=4;
y:(x-2y-3)=5;
г)
sqrt(3x-5)=sqrt(3y+7);
y^2+x=10;
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