宸茬煡X虏-Y虏=8,X-Y=2,姹俋虏+Y虏镄勫

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= （x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8 [(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x= [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 已知x+y/y=11/8,求x-y/x+2y的值. 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/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：3x=8y.求（1）x+y/y (2)2x+3y/x-2y (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai y'-2y=(e^x)-x y'+2y/x=x通解 数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),