x+5y=4 3x-6y=5 求x ,y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x+5y=4 3x-6y=5 求x ,y
已知3X=4X,5Y=6Z求X+Y:Y+Z
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知:4x = 5y,求(x+y) :y
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
方程式计算5X-2=Y 4X+3=Y 求X.Y