已知：
3x+2y=14 ①
x+y+z=10 ②
2x+3y-z=1 ③
②+③=x+y+2x+3y=10+1
3x+4y=11 ④
④-①=（3x+4y）-（3x+2y）=11-14
2y= - 3
y= -1.5
代进去得：x= 17/3
z=35/6
3x+2y=14,x+y+z=10,2x+3y-z=1
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