a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
9+(1+n)2 |
π |
3 |
m |
n |
p |
m |
n |
m |
p |
3 |
a |
b |
a |
b |
a |
b |
a |
b |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
c |
a |
c |
b |
c |
A.4个 | B.3个 | C.2个 | D.1个 |
BA |
BC |
A.
| B.
| C.
| D.2 |
x2 |
a2 |
y2 |
b2 |
1 |
2 |
3
| ||
2 |
27 |
13 |
AM |
AN |
27 |
7 |
a |
b |
a |
b |
1 |
2 |
a |
b |
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