y=3√x-5-2/5√5-x+2求4x+8y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若实数x,y满足x^2+y^2-4x-2y+5=0,求(√x+y)/[√(8y-2x)]
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^2+y^2-4x-2y+5=0,求【2/3x√9x+y^2 √[x/y^2]】的值
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
求5x-2y=x-y=4x-3y-2的解
若2x-3y=0,求5x+4y/3x-2y
3X+2Y=5X+2 2(3X+2Y)=2X+8 求 X Y
方程式计算5X-2=Y 4X+3=Y 求X.Y
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y