Giải các hệ phương trình sau:
1)
x + 2y = 5,
x^2 + 2y^2 - 2xy = 5
2)
4x+4y-5=0
(x+1)^2+(y-3)^2=1
3)
a^2+(b-2)^2=b^2
a^2+(b-1)^2=1
4)
ab-5a-2b+8=0
a^2-4a=b^2-10b+24
5)
xy+x-2=0
2x^3-x^2y+x^2+y^2-2xy-y=0
6)
x+y=1-2xy
x^2+y^2=1
7)
x+y+1/x+1/y=5
x^2+y^2+1/x^2+1/y^2=9
8)
x^2+y^2-x+y=2
xy+x-y=-1
9)
x^3-3x^2+9x+22=y^3+3y^2-9y
x^2+y^2-x+y=1/2
10)
x^2-4x=3y
y^2-4y=3x