已知y=1−4x
已知y=1−4x
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知实数x,y满足方程x*x+y*y-4x+1=0.求y-x的最大值
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知正实数x,y满足x+2y=4,则1x+1y
已知3x-4y/2x+y=1/2 求x/y的值
已知方程组4x+2y=1,20x+8y,求x,y
已知X和Y满足3X+4Y=2,X-Y-1/7
已知x,y满足y^4+2x^4+1=4x^2y,求x,y的值
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知:4x = 5y,求(x+y) :y