a |
b |
a |
b |
a |
b |
7 |
a |
2b |
a |
b |
a |
b |
a |
b |
a |
b |
7 |
a |
b |
a |
a |
b |
b |
a |
b |
a |
2b |
(
|
|
21 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
a |
3 |
b |
1 |
2 |
| ||
2 |
c |
a |
b |
d |
a |
b |
c |
d |
AB |
CD |
AB |
AD |
AC |
A.直角梯形 | B.矩形 | C.菱形 | D.正方形 |
A.-
| B.
| C.-
| D.
|
a |
b |
a |
b |
a |
b |
A.
| B.
| C.|
| D.|
|
a |
b |
3 |
a |
b |
a |
a |
b |
a |
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