400-600-1123
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答案：
C
设60000里
(x/100)*z+(y/100)*(6000-z)=4080
1） y=4x/3 不能求出x,z
2）3(x/100)*z=2（y/100)*(6000-z) 有三个未知数 不能求出x
1)+2)联立以上3式，可以求出x,y,z
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