若|x-2|+|3x-6y|+(3y+z)²=0,求x+y+z的值

2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 若x+y+z=3y=2z,则x/x+y+z=? 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, x+y+z=6 x+2y+3z=14 y+1=z 求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z) 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 2(x+y)(x+y-z)+3(y-z)(x+y-z) 2x-{3z-[3x-2(z-y)-(x+8y-6z)]} 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) (x-3y+2z)(x+3y-2z) （x-2y+3z)(x+2y-3z) (2y-x-3z)(-x-2y-3z) 若|x-2|+|3x-6y|+(3y+z)²=0,求x+y+z的值