X^2+Y^2-4X+Y=0 和X^2+Y^2-2Y-4=0 解方程组

解方程组x^2-y^2=x+y 4x^2-y^2+2x-y=0过程 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1 解方程组:(x-1)(y-2)=xy和x(x+2)-4y(y-1)=(x+2y)(x-2y) 解方程组X+Y/2=3X-2Y=10+6X+Y/4 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组｛ 3x-4y(x-y)=3 { 2x-3y=1 解方程组x+y/3=x-y/4 2x+3y=11 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组