已知 [﹙x²+y²﹚-﹙x-y﹚²﹢2y﹙x-y﹚]÷4y=1 求4x/4x²
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知2x-y/x+3y=2,求代数式﹙4x-2y/x+3y﹚-﹙4x+12y/2x-y﹚的值
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知:x²+y²-2x+4y+5=0,求﹙y/x²-xy﹚-﹙x/xy-x²﹚的
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知关于X,Y的方程组2X+Y=-3,X+3Y=4求代数式3﹙2X+Y﹚-5X﹙2X+Y﹚的值
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知{(x²+y²)-(x-y)²+2y(x-y)}÷4y=1,求4x²-y
当x=﹣1,y=﹣2时,求代数式[﹙x+2y﹚²-(x+y)(5x-y)-5y²]÷﹙2x﹚
(2x-y)²-4(x-y)(x+2y)