X+Y=27 Y+Z=33 X+Y=30

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X+Y=27Y+Z=33X+Y=30X+Y=27Y+Z=33X+Y=30X+Y=27Y+Z=33X+Y=30x+y=27.1y+z=33.2x+z=30.31式+2式+3式得2(x+y+z)=90x+

X+Y=27 Y+Z=33 X+Y=30
X+Y=27 Y+Z=33 X+Y=30

X+Y=27 Y+Z=33 X+Y=30
x+y=27.1
y+z=33.2
x+z=30.3
1式+2式+3式得
2(x+y+z)=90
x+y+z=45.4
将1式代入4式得
27+z=45
z=18
将2式代入4式得
33+x=45
x=12
将3式代入4式得
30+y=45
y=15
所以x=12,y=15,z=18

应该是X+Y=27 Y+Z=33 X+z=30
三式相加除以2得
x+y+z=45,
用它减1式得z=18，减2式得x=12,减3式得y=15

这题太神奇了！！谁能做出来？？

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