1 |
2 |
6
| ||
7 |
4 |
3 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
DN |
NQ |
1 |
2 |
10 |
18
| ||
5 |
2
| ||
5 |
6
| ||
5 |
12
| ||
5 |
1 |
3 |
55 |
7 |
6
| ||
7 |
6
| ||
7 |
1 |
2 |
1 |
3 |
6
| ||
25 |
93 |
5 |
6
| ||
7 |
BE |
AB |
BD |
BO |
DE |
AO |
1 |
3 |
BD |
OB |
1 |
3 |
3BE-12 |
BE+4 |
1 |
3 |
4 |
3 |
4 |
3 |
BD•DE |
BE |
3×4 |
5 |
12 |
5 |
1 |
2 |
1 |
2 |
12 |
5 |
6 |
5 |
1 |
2 |
1 |
2 |
12 |
5 |
6 |
5 |
4 |
3 |
12 |
5 |
36 |
5 |
36 |
5 |
12 |
5 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
36 |
5 |
8 |
5 |
48 |
5 |
OA2+OE2 |
10 |
AO2 |
AE |
144 | ||
4
|
18
| ||
5 |
10 |
18
| ||
5 |
2
| ||
5 |
1 |
3 |
6
| ||
5 |
DN |
NQ |
1 |
2 |
12
| ||
5 |
1 |
3 |
1 |
3 |
1 |
3 |
7 |
3 |
10 |
6
| ||
7 |
2
| ||
7 |
PG2+GE2 |
20 |
7 |
20 |
7 |
55 |
7 |
6
| ||
7 |
55 |
7 |
6
| ||
7 |
1 |
2 |
1 |
3 |
6
| ||
5 |
6
| ||
5 |
6
| ||
25 |
6
| ||
7 |
10 |
12 |
5 |
12 |
5 |
93 |
5 |
93 |
5 |
6
| ||
7 |
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科目:初中數(shù)學 來源: 題型:
已知如圖,直線MN交⊙O于A、B兩點,AC是直徑,AD平分CAM交⊙O于D,過D作DEMN于E.
(1)求證:DE是⊙O的切線;
(2)若DE=6cm,AE=3cm,求⊙O的半徑.
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