若x+y=2010,则2(x-y)+2010=多少呀

若f(x+y,y/x)=x^2-y^2,则F(X,Y)= 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若2x=3y,则(x*x+y*y)/x*x=? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若X.Y为实数,且/X+Y/+根号y-2=0,则（X/Y)2010次方若X.Y为实数，且/X+Y/+根号y-2=0,则（X/Y)2010次方值为多少 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ 若x,y满足等式x方+y方-2x+2y+2=0若x,y满足等式x²+y²-2x+2y+2=0,则x^2010+y^2011=? 若x,y∈R+ 且x+y=20 则lg^x+lg^y的最大值是x,y∈R+ ,x+y=20 lg^x+lg^y=lg(xy)x+y>=2√xyxy 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若x+2y分之x-y=3,则代数式x+2y分之2（x-y)-3(x-y)分之x+2y的值为 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 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 若2x-5y=0,则y：x 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=