5x=6y 6x-1.1=5y x=?y=?
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x+y=5; x^y+y^x=17
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
{x=5y 3x+6y=42
5x=6y x比y=?
1.4Y=X 5X+6Y=39
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2
4x-2y-6y*-y-3x+5y* *=2 就是平方
若5x+3y=3x+4y=x+2y+6,则x+y=___