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歡迎您訪問(wèn)數(shù)學(xué)考題練習(xí):根據(jù)新華社北京5月31日電,今年參加全國(guó)高考的!

數(shù)學(xué)考題練習(xí):根據(jù)新華社北京5月31日電,今年參加全國(guó)高考的

更新時(shí)間:2024-01-12 16:33:05作者:貝語(yǔ)網(wǎng)校

根據(jù)新華社北京5月31日電,今年參加全國(guó)高考的應(yīng)屆普通高中畢業(yè)生667萬(wàn)名.這個(gè)數(shù)字用科學(xué)記數(shù)法表示為

A.6.67×105

B.6.67×106

C.66.7×105

D.0.667×106

試題答案

B

試題解析

數(shù)據(jù)>10時(shí)科學(xué)記數(shù)法的表示形式為a×10n的形式,其中1≤|a|<10,n為整數(shù).確定n的值時(shí),要看把原數(shù)變成a時(shí),小數(shù)點(diǎn)移動(dòng)了多少位,n的絕對(duì)值與小數(shù)點(diǎn)移動(dòng)的位數(shù)相同.當(dāng)原數(shù)絕對(duì)值>10時(shí),n是正數(shù);當(dāng)原數(shù)的絕對(duì)值<1時(shí),n是負(fù)數(shù).

解答:667萬(wàn)=667×104=6.67×106

故選B.

點(diǎn)評(píng):此題考查科學(xué)記數(shù)法的表示方法.科學(xué)記數(shù)法的表示形式為a×10n的形式,其中1≤|a|<10,n為整數(shù),表示時(shí)關(guān)鍵要正確確定a的值以及n的值.

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