12:20=________:2=________%=________=________成=________小數(shù).
1.2 60
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六 0.6
分析:解答此題的關(guān)鍵是12:20,根據(jù)比的基本性質(zhì),比的前、后項(xiàng)都除以10就是1.2:2;根據(jù)比與除法的關(guān)系,12:20=
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,根據(jù)分?jǐn)?shù)的基本性質(zhì),分子、分母都除以2化簡(jiǎn)后是
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;求出12:20的比較用小數(shù)表示是12÷20=0.6;把0.6的小數(shù)點(diǎn)向右移動(dòng)兩位,添上百分號(hào)就是60%;根據(jù)成數(shù)的意義,60%就是六成.由此進(jìn)行轉(zhuǎn)化并填空.
解答:12:20=1.2:2=60%=
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=六成=0.6;
故答案為:1.2,60,
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,六,0.6.
點(diǎn)評(píng):此題主要是考查數(shù)、分?jǐn)?shù)、百分?jǐn)?shù)、比、成數(shù)之間的關(guān)系及轉(zhuǎn)化,利用它們之間的關(guān)系和性質(zhì)進(jìn)行轉(zhuǎn)化即可.