解:(1)拋正方體 ①,落下后每個(gè)數(shù)朝上的可能性都是
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;
拋正方體 ②,落下后每個(gè)數(shù)朝上的可能性都是
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;
(2)拋③號(hào)正方體,落下后“1”朝上的可能性是
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,“2”和“3”朝上的可能性分別是
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和
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.
故答案為:①,②,
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,
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,
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.
分析:(1)因?yàn)棰偬?hào)正方體的6個(gè)面,每個(gè)面分別寫(xiě)上1,2,3,4,5,6,所以拋正方體①,落下后每個(gè)數(shù)朝上的可能性都是1÷6=
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;因?yàn)棰谔?hào)正方體的6個(gè)面,兩個(gè)面寫(xiě)1,兩個(gè)面寫(xiě)2,兩個(gè)面寫(xiě)3,所以拋正方體②,落下后每個(gè)數(shù)朝上的可能性都是2÷6=
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=
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;
(2)因?yàn)棰厶?hào)正方體的6個(gè)面,一個(gè)面寫(xiě)1,兩個(gè)面寫(xiě)2,三個(gè)面寫(xiě)3,所以拋③號(hào)正方體,落下后“1”朝上的可能性是1
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,“2”朝上的可能性是2
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,“3”朝上的可能性是3
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.
點(diǎn)評(píng):本題考查了簡(jiǎn)單事件發(fā)生的可能性的求解,即用“可能性=所求情況數(shù)÷總情況數(shù)”去解答.