[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
(2x+y)²-y(y+4x)-8x等于?
当x=﹣1,y=﹣2时,求代数式[﹙x+2y﹚²-(x+y)(5x-y)-5y²]÷﹙2x﹚
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
﹙x+y﹚﹙x-y﹚-﹙x-y﹚²
已知2x-y/x+3y=2,求代数式﹙4x-2y/x+3y﹚-﹙4x+12y/2x-y﹚的值
[﹙x+2y﹚﹙x-2y﹚-﹙2x-y﹚²+﹙3x-y﹚﹙2x-5y﹚]÷﹙-1/3x﹚初一
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
(x-y)³(x-y)²(y-x)等于多少
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
解方程组{x²+2xy+y²=25,﹙x-y﹚²-3x+3y+2=0}