x/3 + y/4 =54/60 x/5+y/4=42/60 求x=?y=?
已知:4x = 5y,求(x+y) :y
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x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
x+5y=4 3x-6y=5 求x ,y
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
方程式计算5X-2=Y 4X+3=Y 求X.Y
求5x-2y=x-y=4x-3y-2的解
已知3X=4X,5Y=6Z求X+Y:Y+Z
若2x-3y=0,求5x+4y/3x-2y