【題目】已知a和b是兩個質(zhì)數(shù),這兩個數(shù)的最小公倍數(shù)是( )。
A.a(chǎn) B.b C.a(chǎn)b
【答案】C
【解析】因為a和b是兩個質(zhì)數(shù),所以它們是互質(zhì)數(shù),是互質(zhì)數(shù)的兩個數(shù)的最小公倍數(shù)是它們的乘積,所以它們的最小公倍數(shù)是ab;據(jù)此選擇即可。
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【題目】
= = = =
= = = =
= = = =
= = = =
= = = =
= 2.5×16= = =
= = =
= 1.5÷0.05= = 1.5÷0.05=
= = = 2.5×0.4=
= = = =
= = = =
= = = 6.25+1.75=
= = = =
= = = =
= = = =
= =
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【題目】如圖是一張百數(shù)表,它能幫助我們學習很多關于“因數(shù)和倍數(shù)”的數(shù)學知識。請你用“__”劃出所有3的倍數(shù),用“○”圈出所有9的倍數(shù)。從你圈出的數(shù)中,你能歸納出能被9整除的數(shù)的特征嗎?
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