已知3/5x=1/2y x+y=88 求:x=?y=?
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-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2(x-y)/X+Y-3X+Y/X+Y
已知4x=9y求(1)x+y/y (2)y-x/2x
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知:4x = 5y,求(x+y) :y
已知1/x+1/y=5,求2x-3y+2y/-x+2xy-y
已知1/x+1/y=5,求(2x-3y+2y)/(x+2xy+y)的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知3x-2y/x+y=5/3求x;y的值