x+y=8 y+z=12 x+z=10 x+y+z=

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x+y=8 y+z=12 x+z=10 x+y+z=
x+y=8 y+z=12 x+z=10 x+y+z=

x+y=8 y+z=12 x+z=10 x+y+z=
x+y+z=（x+y+y+z+x+z）/2=(8+12+10)/2=15

三次相加除以2
=15

x+y=8 ..................1
y+z=12 ...................2
x+z=10 ...................3
1+2+3 2（x+y+z)=30
x+y+z=15

x+y=8 y+z=12 x+z=10
2（x+y+z）=30，x+y+z=15

x+y=8 ....1
y+z=12....2
x+z=10 ...3
1+2+3,得2（x+y+z）=30，所以x+y+z=15

x+y+z=（x+x+y+y+z+z）/2=(8+12+10)/2=15

(x+y)+(y+z)+(x+z)=12+8+10=30
即2x+2y+2z=30
则x+y+z=15

x+y=8 y+z=12 x+z=10 x+y+z= x+y=8 y+z=12 x+z=10 x+y+z= (x+y-z)(x-y+z)= 若X/10=Y/8=Z/9则X+Y+Z/Y+Z=? X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 已知x+y=8,y+z=12,x+z=10,则x+y+z=? 若x+y=8 y+z=12 x+z=10 则x+y+z =多少 X=3z X+y+z=12 X+2y-2z=10 X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) 已知x+y=8,x+z=12,x+z=10,则x+Y+z等于几? (x+y+z)÷10=x+1.1 y+x=z-80+y-1 z-y=8x+y+8 x+z÷y=? 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)=? (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值解方程 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