Question

11．用簡便方法計算
0.46×0.27+0.73×0.46                 
4.8×10.1
2.7÷0.25÷4                      
4.16÷0.125÷4.16．

Answer 1

分析 ①0.46×0.27+0.73×0.46，運用乘法分配律簡算；                 
②4.8×10.1，運用乘法分配律簡算；
③2.7÷0.25÷4，運用除法的運算性質(zhì)簡算；                 
④4.16÷0.125÷4.16，運用除法的運算性質(zhì)簡算；

解答 解：①0.46×0.27+0.73×0.46  
=0.46×（0.27+0.73）
=0.46×1
=0.46；
               
②4.8×10.1
=4.8×10+4.8×0.1
=48+0.48
=48.48；

③2.7÷0.25÷4  
=2.7÷（0.25×4）
=2.7÷1
=2.7；
                    
④4.16÷0.125÷4.16
=4.16÷4.16÷0.125
=1÷0.125
=8．

點評 此題考查的目的是理解掌握小數(shù)四則混合運算的順序以及它們的計算法則，并且能夠靈活選擇簡便方法進行計算．