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æ ¹æ®é¢ç®å¾å° H = 120ï¼ M = 104
(H + x ) : (M - x ) = 9 ï¼ 5
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æ 9ï¼M - x ï¼= 5 ( H + x )
å³ 9 M - 9x = 5 H + 5x
9 M -5 H = 5x + 9x = 14x
å³ 9 * 104 - 5 * 120 = 14x
936 - 600 = 14x ï¼ 336 = 14x
x = 336 / 14 = 24
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ï¼H + 24) : (M - 24) = 9 : 5
(120 + 24) : (104 - 24) =9 : 5
144 : 80 = 9 : 5 ï¼ 720 = 720
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çï¼å°æè¦ç»å°çº¢çé®ç¥¨æ°ä¸º 24 æã
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