數(shù)學公式=24：30=0.8=數(shù)學公式=________%=________成．

80    八
分析：解答此題的關鍵是0.8，小數(shù)點向右移動兩位，加上%即可寫成百分數(shù)是80%，寫成成數(shù)是八成，由此即可填空．
解答：根據(jù)題干分析可得：=24：30=0.8==80%=八成．
故答案為：80；八．
點評：本題是利用比、分數(shù)與除法的關系和基本性質來解決問題的．
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