若有理数x,y满足|x|=x,|y|=-y,且|x|〈|y|,化简|x|-|y|-|x-y|

如果x,y表示有理数,且x、y满足条件,|x|=5,|y|=2.|x-y|=y-x,求：x+2y的值. 若有理数x,y满足x+3y+根号3y=15+2倍根号3,且x>y,求根号下2x+y x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y 实数x，y满足tanx=x，tany=y，且|x|≠|y|，则sin(x+y)x+y−sin(x−y)x−y 若x,y满足y 已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值. 设X,Y是有理数,且X,Y满足X+2Y-(√2)Y=17+4√2试求(√X+Y)^2010的值. 设x、y是有理数,且x、y满足等式x+2y-根号2y=17+4根号2,求(根号x+y)^2011的值 设x,y是有理数,且x,y满足等式x+2y-y√2=17+4√2,求（x+y)∧2010的值 设x,y是有理数,且x,y满足等式x^2+2y+√2y=17-4√2,求x,y的值 {(x,y) |x|+|y| x>y?x:y