1.5/y÷x/y－5/x÷y/x＝5/xy2.1/x²－y²÷﹙1/x－y － 1/x＋y﹚＝2y 3.x－1/x÷﹙1－1/x﹚＝14.﹙1－1/x－1﹚÷1/2﹣2－x＝15.﹙1＋4/a－2﹚÷a/a－26.3－a/2b÷a/b×b/aORZ ORZ ORZ ORZ关于第二题= =我真心打对了，

[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 [(x+2y)^2-(x-y)(x+2y)-5y^2]÷(2y) 计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x) 【(x+2y)^2－(x－y)(3x+y)－5y^2】÷2x化简带过程 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ [(x-2y)(x+2y)+4(x-y)^2]÷5y （2/3x－2/x＋y（x＋y/3x－x－y））÷x－y/x,其中5x＋3y＝0 先化简,再求值[(2x+y)^2-(2x+y)(2x-y)-y(5x+y)]÷(1/2y),其中x-y=2 因式分解[(4x+y)(4x－y)－(2x－3y)2－2y(2x-5y)]÷4x [(x+2y)的平方-(x+y)(3x-y)-5y的平方]÷(2x),其中x＝-1,y＝-2. ((x+2y)x^2+（x-y）（3x-y)-5y^2）÷2x [(5X+3Y)(4X-3y)-(X+3Y)(X-3Y)]÷(-4X) 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知x²+4y²-4x+4y+5=0,求(2x-y)(x+y)/x四次方-y四次方×xy-y²/2x-y÷(y/x²+y²)² 已知:3x-5y=0,求x/y,x-y/y,x-y/x