实数x,y,z满足x=y+根号2,2xy+2*根号2*z*z+1=0,则x+y+z等于多少这是道奥赛题,

实数x,y,z满足x=y+根号2,2xy+2*根号2*z*z+1=0,则x+y+z等于多少这是道奥赛题, 已知实数x,y,z,满足那么x+y=6,z^2=xy-9,求(x+y)^z 已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1+2根号z-1求X+2Y+3Z 已知实数x,y,z满足x=6-y,z^2=xy-9,求证：x=y 已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y 实数x,y,z 满足x²+y²+z²=1,则根号2xy+yz的最大值是多少 已知实数X,Y满足根号2X-Y-8+根号X+2y+1=0,求XY. 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里 已知实数x,y,z满足x=6-y,z^2-4z+4=xy-9,求x,y,z的值 已知实数x,y,z满足x=6-y,z^2-4z+4=xy-9,求x,y,z的值. 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=?我很着急 已知实数x.y.z满足x+y=5及z的2次方=xy+y-9则x+2y+3z=? 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=? 已知实数x,y,z满足x-y=5,z^2=-xy-y-9,求x-2y+3z的值 已知实数x .y.z.满足2^x=3^y=6^z 求证:xy+yz=xz 已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值 已知实数x、y、z满足x＋y=5,z的平方=xy+y-9,那么x+2y+3z=( ) 求教三道数学题(1)已知y＝ 根号[(x^2-2)/(5x-4)]-根号[(x^2-2)/(4-5x)] +2,求(x^2+y^2) 的值.(2)若有理数x,y,z满足根号x+ 根号(y-1)+根号(z-2)=1/2(x+y+z),求(x-xy)^3 的值(3)实数x,y满足根号(x^2+1997)*根号(y^2+1997)-y=1997