若（x+y）2=17,(x-y)2=3,则x分之y加y分之x=

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（） 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若2x=3y,则(x*x+y*y)/x*x=? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? [(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5 先化简,再求值 [2/3x - 2/x+y（x+y/3x -x-y）]*x/x-y,其中5x+3y=0 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=