Question

18．脫式計算
①7.2×0.8+1.04   
②6.83×7.5+6.83×2.5
③1.08×0.88÷0.27                
④2.05÷0.82+33.6．

Answer 1

分析 ①首先計算乘法，然后計算加法；
②根據(jù)乘法分配律，計算即可；
③首先計算乘法，然后計算除法；
④首先計算除法，然后計算加法．

解答 解：①7.2×0.8+1.04 
=5.76+1.04
=7.8  
②6.83×7.5+6.83×2.5
=6.83×（7.5+2.5）
=6.83×10
=68.3
③1.08×0.88÷0.27  
=0.9504÷0.27
=3.52            
④2.05÷0.82+33.6
=2.5+33.6
=36.1

點評 完成本題要注意分析式中數(shù)據(jù)，運用合適的簡便方法計算．