If x+y=a,y+z=b, andx+z=c, whatisthe average (arithmetic mean) of x, y, and z?

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问题 If x+y=a,y+z=b, andx+z=c, whatisthe average (arithmetic mean) of x, y, and z?

选项 A、 
B、 
C、 
D、 
E、 

答案D

解析
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