Question

小明用計(jì)算器在計(jì)算5.8×0.24時(shí)，計(jì)算器小數(shù)點(diǎn)的按鍵壞了，于是他就按成58×24結(jié)果是1392，這道題的正確答案是

 

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Answer 1

分析：根據(jù)小數(shù)乘法的計(jì)算法則，先按照整數(shù)乘法算出積，再看兩個(gè)因數(shù)一共有幾位小數(shù)，就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．據(jù)此解答．

解答：解：根據(jù)小數(shù)乘法的計(jì)算法則可知，積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)之和，
因?yàn)?.8是一位小數(shù)，0.24是兩位小數(shù)，所以積的小數(shù)位數(shù)是1+2=3位．
故答案為：1.392．

點(diǎn)評(píng)：此題解答關(guān)鍵是明確：積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)之和．