x+y+z=26.(1)
x-y+z=8.(2)
2x-y+z=18.(3)
(1)-(2)得
2y=18
y=9
代入(2)(3)得
x-9+z=8
x+z=17.(4)
2x-9+z=18
2x+z=27.(5)
(5)-(4)得
x=10
代入(4)得
10+z=17
z=7
解得
x=10
y=9
z=7
x+y+z=26,x-y+z=8,2x-y+z=18
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