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12釐米是5分米的幾分之幾 5分米=50釐米 所以 12÷50=6/25 答:12釐米是5分米的25分之6 如還不明白,請繼續追問. 手機提問的朋友在用戶端右上角評估點【滿意】即可.
(2/3+1/4)÷(4/5*7/8) =11/12÷7/10 =55/42
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