x+y=15 y+z=-6 x+z=7

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x+y=15y+z=-6x+z=7x+y=15y+z=-6x+z=7x+y=15y+z=-6x+z=7x+y=15y+z=-6得出x-z=15-（-6）即x-z=21x-z=21x+z=7得出x=14

x+y=15 y+z=-6 x+z=7
x+y=15 y+z=-6 x+z=7

x+y=15 y+z=-6 x+z=7
x+y=15 y+z=-6 得出 x-z=15-（-6）即 x-z=21
x-z=21 x+z=7 得出 x=14 z=-7
x=14代入 x+y=15 得出 y=1
所以 x=14 y=1 z=-7

三式相加得 2x+2y+2z=16 x+y+z=8
则x=8-(-6)=14
y=8-7=1
z=8-15=-7

(x+y-z)(x-y+z)= fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 (1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1. 解方程：x+y+z=6 15x+7y+9z 请问x=?,y=?z=? X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z 解方程 x(x+y+z)=6 y(x+y+z)=12 z(x+y+z)=18 解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18 解方程组：{x(x+y+z)=6 {y(x+y+z)=9 {z(x+y+z)=10 x-4y+z=-302x+y-z=18x--y-z=7 x+y+z=14 7z=x+y+2 x+z=y x+y+z=15 x+5y+10z=70 x,y,z,各是几? x+y+z=15 x+5y+10z=70 x,y,z,各是几? X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z x+y-z=6,x+y=15,z×x=63.求x,y,z