若/x+2y-5/+（2y+3z-13）²+（3z+x-10）²=0,试求x,y,z的值.

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. 若/x+2y-5/+（2y+3z-13）²+（3z+x-10）²=0,试求x,y,z的值. 若3x+4y+5z=17,3x+2y+z=13,则x+y+z= ） 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 x/2=y/3=z/5 x+3y-z/x-3y+z 若x+y+z=3y=2z,则x/x+y+z=? 三元一次方程：x+y-z=0 x+2y+z=13 2x-3y+2z=5x+y-z=0 x+2y+z=13 2x-3y+2z=5 方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1 -2X+3Y+Z=-4-X-5Y-2Z=-13X+Y-Z=10 5x+4y+z=0 3x+y-4z=13 x+y+z=—2 若2x=3y=5z,则3x-2y+z/x+y-z 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 若x/3=y/2=z/5,则2x-3y-z/x-y+z= （2x-3y+z）-3{x-2【-z+（x-y）】-（3y-5z）} 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值