若4x+3y+2z=15,x-2y+3z=10,则x+y+z=?

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 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 2x+z=10 x+y-z=4 3x-y-z=0 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, x+2y+3z=10,4x+3y+2z=15则x+y+z= x+2y+3Z=10,4x+3y+2z=15,求x+y+z= 2x+y+3z=10,3x+4y+2z=15,则x+y+z= 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 2x+3y-z=9,x+y+z=15,5x-4y-z=0 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z