①當(dāng)a,b,c為兩正一負(fù)時(shí),
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
②當(dāng)a,b,c為兩負(fù)一正時(shí),,
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
∴
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
所有可能的值為0.
故選D
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |