数学题X+Y+Z=111 Y/X=3/2 Y/2=5/6X+Y+Z=111Y/X=3/2Y/2=5/6

求解一道数学题若x+y+z+3=2(根号x+根号y+1+根号z-1),求（x+y+z)的（y-z）次方 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 一条分式数学题已知x y z满足x/x+y + y/z+x + z/x+y =1,求x²/x+y + y²/z+x + z²/x+y的值.3Q 200分求数学题,急x+y-z=-14x-3y+2z=162x-2y-3z=5求z等于多少 一道数学题：若x:y:z=2:3:4,求分式x-y-z /2x+3y的值若x:y:z=2:3:4,求分式x-y-z /2x+3y的值 解答初三数学题啊{ x+y=z+x=y+z 2 3 4 分数线我就不打了）设线段X.Y.Z满足 { x+y+z=27 求x.y.z.的值 数学题X+Y+Z=111 Y/X=3/2 Y/2=5/6X+Y+Z=111Y/X=3/2Y/2=5/6 6/5x+y-z=4/3x+2z=5/3y+z=2初一的数学题 5x+y-z/6=3x+2z/4=3y+z/5=2 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 一道三元二次方程组数学题x^2=6+(z-y)^2y^2=2+(z-x)^2z^2=3=(x-y)^2 已知2x=3,2y=5,2z=15.求证x+y=z数学题:求大神x。y。z。为指数 数学题{x+2Y+3z=14 2x+y+z=7 3x+y+2z=11 一道数学题,已知x+y+z=1,x^2+y^2+z^2=2,问xy+yz+zx,x^3+y^3+z^3 数学题若1/x+2/y+3/z=5,3/x+2/y+1/z=7,求1/x+1/y+1/z=多少+,q 一道三元一次数学题高手来帮帮忙~~{3x-y+z=4{2x+3y-z=12{x+y+z=6 一道数学题,请速答,谢谢.已知方程组4x-5y+2z=0,x+4y=3z,则x：y：z=________. 一道数学题(方程组)1/x+1/(y+z)=1/2 1/y+1/(z+x)=1/3 1/z+1/(x+y)=1/4