数学测评初2上册54页13,一个括号里面有数字叫做根号,X减根号2y＝根号2,根号2x减y＝1.

数学测评初2上册54页13,一个括号里面有数字叫做根号,X减根号2y＝根号2,根号2x减y＝1. 代数式求值.已知x=2,y=根号3,求 (根号x-根号y)/(根号x+根号y)+(根号x+根号y)/(根号x-根号y) 已知x =2y 化简（根号y/根号x -根号y )-(根号y/根号x +根号y) 已知x=2y,化简根号y/(根号x-根号y)-根号y/(根号x+根号y) 已知x=2y,化简:根号y/根号x -根号y -根号y/根号x +根号y x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y 化简:((根号x-根号y)^3+2x根号x+y根号y)/(x根号x+y根号y)+(3根号xy-3y)/(x-y) 根号X（根号X-根号Y）＝3根号Y（5根号Y-根号X）,求（2X-根号XY＋3Y)/X+根号XY-6Y 1.解方程组.根号2乘以x-根号3乘以y＝根号3根号3乘以x-根号2乘以y＝2乘以根号22.解方程.（根号y分之x-根号 根号x减根号y分之（x减y）加（根号x加根号y）分之x加y加2根号xy {（x-y)/(根号x+根号y)}-(x+y-2倍根号xy)/(根号x-根号y)=? 化简:(x-y)除以(根号x+根号y)-(x-2根号xy+y)除以(根号x-根号y)