y=3x和5x+6y=46
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
X+Y=12,X和Y( )比例;6分之X和Y分之5,X和Y( )比例
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
5x=y,5:y=x,3x=4y,3:x=4:y,3;x=y:4,3x+4x=y,3x+4=y y和x成比例吗
3x+2y=5 3y+2x=5 求x和y
解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1
若x和y互为相反数,则3x-10+3y+y/5x=
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
解方程组x:y=2:3和5x+3y=38 3y+x/y=8和9y-2x/y=9
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值