5X＝2,5Y＝3,5X＋Y

3x(2x＋y)－2x(x-y),其中x＝1,y=1/5 化简:5(x-y)+2(x+y)-3(x-y) 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若｜x-y-5｜与｜2x+3y-15｜互为相反数,则x+y＝? (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) (2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 （2/3x－2/x＋y（x＋y/3x－x－y））÷x－y/x,其中5x＋3y＝0 [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 (3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x＝三分之一,y＝-二分之一.先化简再求值. [(x+2y)的平方-(x+y)(3x-y)-5y的平方]÷(2x),其中x＝-1,y＝-2. 已知-x＋2y＝5则5（x-2y）-3（x-2y）-60 X,Y的值是X＋3Y＝5,X≡2,Y等于多少? 2x＋5y＝4.4y－3x＝8解方程组 2x＋5y＝232y－3x＝10 [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)我急用