x+2y=3 x+y+z=36 2x+y+z=15 2y=3z x-y=1 x+2y+z x-z=-1 2x+z-y=18 x+y+2z=17x+2y=3 2y=3z x-y=-1x+y+z=36 x-y=1 2x+z-y=18 2x+y+z=15 x+2y+z=16 x+y+2z=17
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x+2y=3 x+y+z=36 2x+y+z=15 2y=3z x-y=1 x+2y+z x-z=-1 2x+z-y=18 x+y+2z=17
x+2y=3 2y=3z x-y=-1
x+y+z=36 x-y=1 2x+z-y=18
2x+y+z=15 x+2y+z=16 x+y+2z=17
x+2y=3 2y=3z x-y=-1
x+2y=3 ①
2y=3z ②
x-y=-1 ③
①-③得 3y=4 ,得 y=4/3
代入③,得 x=y-1=1/3
代入②,得 z=2/3y=8/9
x+y+z=36 x-y=1 2x+z-y=18
x+y+z=36 ①
x-y=1 ②
2x+z-y=18 ③
①-②得 2y+z=35 ④
2*①-③得 3y+z=54 ⑤
3*④-2*⑤得 z=-3
代入z到④,得y=19
代入y和z到①,得x=20
因此 x=20 y=19 z=-3
2x+y+z=15 x+2y+z=16 x+y+2z=17
2x+y+z=15 ①
x+2y+z=16 ②
x+y+2z=17 ③
①-2*②得 -3y-z=-17 ④
①-2*③得 -y-3z=-19 ⑤
④-3*⑤得 8z=40 z=5
代入z到④,得y=4
代入y和z到①,得x=3
因此 x=3 y=4 z=5
o(∩_∩)o
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