1. 设é¿å®½åå«ä¸ºa, b cm
60: a = 1 : 80, a = 60*80/1 = 4800 cm = 48 m
45 : b = 1 : 80, b = 45*80/1 = 3600 cm = 36 m
大å
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é¢ç§¯æ¯ 48 * 36 = 1728 å¹³æ¹ç±³
é¿4800 cm, æ¯æ¹ç è¾¹é¿ç4800/80 = 60å
é¿4800 cm, æ¯æ¹ç è¾¹é¿ç3600/80 = 45å
éè¦æ¹ç 60*45 = 2700å
2. 5x ï¼ 15 = 2(3x-15)
5x + 15 = 6x -30
x = 45
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