4.7÷2.2= 70.7÷33= 2.29÷1.1= 用简便方法计算

4.7÷2.2=70.7÷33=2.29÷1.1
=47÷22=70.7÷33=22.9÷11
=141÷66=141.4÷66=137.4÷66
=【（141+141.4+137.4）÷66】÷3
=419.8÷66÷3
=209.9÷99
≈2.12