Question

10．在橫線(xiàn)填上“＜”“＞”或“=”．
12.3×1.12＞12.3                           7.08÷1.2＜7.08
0.999×2.54＜2.54                          6.4÷0.4＞6.4×0.4．

Answer 1

分析 一個(gè)數(shù)（0除外）乘大于1的數(shù)，積比原數(shù)大，乘小于1的數(shù)，積比原數(shù)小，乘1，積與原數(shù)相等；除以大于1的數(shù)，商比原數(shù)小，除以小于1的數(shù)，商比原數(shù)大，除以1，商等于原數(shù)；據(jù)此即可判斷．

解答 解：12.3×1.12＞12.3                           7.08÷1.2＜7.08
0.999×2.54＜2.54                          6.4÷0.4＞6.4×0.4．
故答案為：＞，＜，＜，＞．

點(diǎn)評(píng) 此題主要依據(jù)積或商的變化規(guī)律解決問(wèn)題．熟記積或商的變化規(guī)律是解題的關(guān)鍵．