一道初中代数题若y,z均为质数,x=yz,x,y,z满足1/x+1/y=3/z,则1998x+5y+3z等于多少?（选项

一道初中代数题若y,z均为质数,x=yz,x,y,z满足1/x+1/y=3/z,则1998x+5y+3z等于多少?（选项 若y,z均为质数,x=yz,且x、y、z满足1/x+1/y=3/z,则1998x+5y+3z=_____ 若实数x,y,z满足x+y+z=5,xy+yz+xz=3,求z的最大值 若有理数x,y,z满足√x+√y-1+√z-2=1/2(x+y+z) 确定(x-yz)^3 X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少? 若实数x,y,z满足x+y/1=4,y+z/1=1,z+x/1=3/7,则xyz的值为多少 时数x,y,z满足x+y+z=5,xy+yz+zx=3,求Z最大值 已知x,y,z满足xyz=1,求证x^3/(x+y)+y^3/(y+z)+z^3/(z+x)大于等于3 已知x、y、z满足2x+3y+z=48 x-2y+2z=56 3x+5y+3z=52 则x+y+z的值为多少 急 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 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 已知x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求代数式x2/(y+z)+y2/(x+z)+z2/