y^2-y=2
y^2-y-2=0
y^2-2y+y-2=0
y(y-2)+(y-2)=0
(y-2)(y+1)=0
suy ra y-2=0 hoặc y+1=0
suy ra y=2 hoặc y=-1
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y^2-y=2
y^2-y-2=0
y^2-2y+y-2=0
y(y-2)+(y-2)=0
(y-2)(y+1)=0
suy ra y-2=0 hoặc y+1=0
suy ra y=2 hoặc y=-1
giai phuong trinh x^2 -y^2 = 189
giai phuong trinh nghiem nguyen:x^4+x^2-y^2-y+20=0
Giai phuong trinh nghiem nguyen sau
x^2 +y^2-x-y=8
giai phuong trinh
2x^2 + 3xy + y^2 = 0
Giai phuong trinh x^2+(1/x^2)+16y^2+(1/y^2)=10
Giai phuong trinh x2+ y22+z22=y(x+z)
giai phuong trinh x^2+y^2+6y+5=0
giai phuong trinh x2-xy+y2=3
giai phuong trinh nghiem nguyen
2xy-2x-2y=4
y^2+2xy-3x-2=0