{x+y+z=3.3x/3+y/4+z/5=51/60x/5+y/4+z/3=53.4/60（解这个三元一次方程组,因为我不会,答案x=1.2 y=0.6 z=1.5可以写明白点吗？我不懂

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,z不是0.3z=4y,z=3x求（x+y）：（x+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 2x+z=10 x+y-z=4 3x-y-z=0 (x+y-z)(x-y+z)= x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 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) (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 4x-3y-3z=0 x-3y+z=0 并且X Y Z不等于0 求x:z 和y:z的值 方程组｛4x-3y-3z=0,x-3y+z=0,(x.y.z不等于0),求x/z和y/z的值? 3x-y+z=4,2z+3y-z=12,x+y+z=6的解 x/2=y/3=z/4,则x+2y-z/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 已知:x/y=3,x/z=4,求代数式x+y+z/x-y+z的值 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z