若X+2Y+3Z＝10,4X+3Y+2Z＝15则X+Y+Z等于多少?

2x+z=10 x+y-z=4 3x-y-z=0 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 若x+2y-4z＝0 3x+y-z＝0 求x：y：z 若X Y Z 满足方程组 X-2Y＋3Z＝0 2X-3Y＋4Z＝0 则 X：Y：Z ＝? (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z} 若x+y+z=3y=2z,则x/x+y+z=? x+2y=3x+2z=4y+z 求x:y:z x+y/2=z+x/3=y+z/4 x+y+z=27 数学--整式运算4(x-y+z)-2(x+y-z)-3(-x-y-z) (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 {2x+y=10 {x-y+z=4 {3x-y-z=0 求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z) X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 因式分解Z^2(x-y)-4(x-y)-3Z(y-z) 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 若X+2Y+3Z＝10,4X+3Y+2Z＝15则X+Y+Z等于多少?