{x+y-z=11,x-y-z=-5,x-y+z=1
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{x+y-z=11,x-y-z=-5,x-y+z=1
x+y-z=11 ①
y+z-x=5 ②
z+x-y=1 ③
三式相加,得:x+y+z=17 ④
④-②得:2x=12 x=6
④-③得:2y=16 y=8
④-①得:2z=6 z=3
X=6
Y=8
Z = 3
{x+y-z=11 y+z-x=5 z+x-y=1
{x+y-z=11,x-y-z=-5,x-y+z=1
(x+y-z)(x-y+z)=
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
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(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
z+=x>y?++x:
x/2=y/3=z/5 x+3y-z/x-3y+z
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
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x=y; y=z; z=x/y
解三元一次的方程 x+y-z=11 y+z-x=5 z+x-y=1