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¬å¼ï¼ ä¸å±±æ¶é´ =ä¸å±±è·¯ç¨ ÷ ä¸å±±é度
ä¸å±±æ¶é´ =ä¸å±±è·¯ç¨ ÷ ä¸å±±é度
æ»è·¯ç¨ =ä¸å±±è·¯ç¨ + ä¸å±±è·¯ç¨
æ»æ¶é´ =ä¸å±±æ¶é´ + ä¸å±±æ¶é´
å¹³åé度 = æ»è·¯ç¨ ÷ æ»æ¶é´
= 2S ÷ï¼S/3 + S/6ï¼
= 4ï¼åç±³/å°æ¶ï¼
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