{6x+6Y=120 6X+4y=10}
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
已知:4x^2+y^2-4x-6y+10=0,求y/x-x/y的值
2x+y=4x-y-1/2=10+6x+2y/4
解方程组X+Y/2=3X-2Y=10+6X+Y/4
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
设十位为x,个位数字为 y,列方程组 x+y=6,10x+y+18=10y+x x=2,y=4
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0