如果3X+7Y+Z=1,4X+10Y+Z=2006,求X+3/2005X+2005Y+2005Z

如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y 已知3X+7Y+Z=6 4X+10Y+z=7 求X+Y+Z=? 知3x+7y+z=315,4x+10y+z=420,求x+y+z=? 4X+Y+10Z=169 3X+Y+7Z=126 求X,Y,Z 已知3x+7y+z=315和4x+10y+z=420,求x+y+z 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, (x-2y+z)/9=(2x+y+3z)/10=-(3x+2y-4z)/3=1 连等,求x,y,z, 已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值 已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3 若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.