已知x+2y+3z=54,3x+y+2z=47,2x+3y+z=31,那么带数式x+y+z的值是A 132 B 32 C 22 D 17
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已知x+2y+3z=54,3x+y+2z=47,2x+3y+z=31,那么带数式x+y+z的值是A132B32C22D17已知x+2y+3z=54,3x+y+2z=47,2x+3y+z=31,那么带数
已知x+2y+3z=54,3x+y+2z=47,2x+3y+z=31,那么带数式x+y+z的值是A 132 B 32 C 22 D 17
已知x+2y+3z=54,3x+y+2z=47,2x+3y+z=31,那么带数式x+y+z的值是
A 132 B 32 C 22 D 17
已知x+2y+3z=54,3x+y+2z=47,2x+3y+z=31,那么带数式x+y+z的值是A 132 B 32 C 22 D 17
把前面这3个式子加在一起,得
（x+2y+3z）+（3x+y+2z）+（2x+3y+z）=54+47+31
即 6（x+y+z）=132
x+y+z=22