a |
|a| |
|b| |
b |
c |
|c| |
|abc| |
abc |
bc |
|ab| |
ac |
|bc| |
ab |
|ac| |
a |
|a| |
b |
|b| |
c |
|c| |
a |
|a| |
|b| |
b |
c |
|c| |
a |
|a| |
b |
|b| |
c |
|c| |
a |
|a| |
b |
|b| |
c |
|c| |
-abc |
abc |
bc |
ab |
ac |
-bc |
ab |
-ac |
A.负数 | B.正数 | C.负数或0 | D.非负数 |
x-1 |
5x+y2 |
5 |
7 |
7 |
1 |
4 |
81 |
25 |
3 | -1 |
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