C

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C
A
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• ????

3.????????6,??????5p,????????
( ) A.5p B.10p
C.15p D.30p
C
4.??,???????a,????????????,a?????,???????????

(
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B
A.4-2p B.2p-4 C.p-2 D.2(4-p)
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D
4?cm
6.????6cm???,120?????????? .
22.5
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6
240
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2?
3?
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?1???????????ABC??????,??????75?
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• ??????????8cm, ???20cm, ????????????????.

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????????????????18cm,????2400???,????????
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?2??,?????????????????12cm,????????????6cm,??????
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??3?(2003????)?????90???OAB???OCD???????????,??A
C?BD
(1)???AOC??BOD (2)?OA3 cm,OC1 cm,????????.
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??4?(2003???????)??????????,???1,??????????(??),?
?B???????????????? ( )
B
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