X:Y:Z=3:4:5 X+Y+Z=36 二元一次方程 求出X Y Z

2x+Y+3z=23,x+4y+5z=36,求X+2Y+3z~ X:Y:Z=3:4:5 X+Y+Z=36 二元一次方程 求出X Y Z (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 x/2=y/3=z/5 x+3y-z/x-3y+z x+y/2=z+x/3=y+z/4 x+y+z=27 x+2y=3x+2z=4y+z 求x:y:z x+y=5 2x+3y-z=9 x-y+z=4 已知3X=4X,5Y=6Z求X+Y：Y+Z {x：y：z=3：4：5｛x+y+z=36 X/Y/Z=3/4/5 X+Y+Z=36 (x+y-z)(x-y+z)= x,y,z不是0.3z=4y,z=3x求（x+y）：（x+z）. 一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.