x |
|x| |
A.正数 | B.非正数 | C.负数 | D.非负数 |
x |
|x| |
b |
a |
2xy |
π |
3a2b3c |
4 |
5 |
6+m |
s |
7 |
1 |
x |
A.2 | B.3 | C.4 | D.5 |
1 |
x |
a+b |
2 |
3y |
π |
1 |
m |
3 |
x+y |
5 |
6 |
A.1 | B.2 | C.3 | D.4 |
1 |
a |
2xy |
π |
3a2bc |
4 |
5 |
x+1 |
x |
2 |
y |
3 |
1 |
y |
A.2 | B.3 | C.4 | D.5 |
3x |
2 |
4 |
x+y |
x2+2 |
π |
5 |
8 |
1 |
m |
A.1个 | B.2个 | C.3个 | D.4个 |
x |
x+1 |
1 |
3 |
x2 |
x |
a |
π |
A.1 | B.2 | C.3 | D.4 |
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