Question

【題目】0.78÷3.9，除數(shù)是位小數(shù)，被除數(shù)和除數(shù)的小數(shù)點(diǎn)同時(shí)向移動(dòng)位，轉(zhuǎn)化成÷ ．

Answer 1

【答案】1；右；1；7.8；39
【解析】解：0.78÷3.9，除數(shù)是1位小數(shù)，被除數(shù)和除數(shù)的小數(shù)點(diǎn)同時(shí)向 右移動(dòng)1位，轉(zhuǎn)化成 7.8÷39．
故答案為：1，右，1，7.8，39．
根據(jù)小數(shù)的定義可知除數(shù)3.9是1位小數(shù)，再根據(jù)小數(shù)除法法則和商不變的性質(zhì)即可求解．考查了小數(shù)除法．除數(shù)是小數(shù)的除法，先利用除法中除數(shù)與被除數(shù)同時(shí)擴(kuò)大或縮小相同的倍數(shù)商不變，去掉除數(shù)的小數(shù)點(diǎn)，然后再按整數(shù)除法計(jì)算，商的小數(shù)點(diǎn)與被除數(shù)的小數(shù)點(diǎn)對(duì)齊．