{X+5Y=6 {3X-6Y-4=0
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
{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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1