脱式计算，能简算的要简算．2.139÷9.3×6.22.06+2.06×990.72×0.8÷0.323.8×1.96-3.8×0.96．

Question

脱式计算，能简算的要简算．
2.139÷9.3×6.2                  
2.06+2.06×99
0.72×0.8÷0.32                  
3.8×1.96-3.8×0.96．

Answer 1

（1）2.139÷9.3×6.2
=0.23×6.2
=1.426
             
（2）2.06+2.06×99
=2.06×（99+1）
=2.06×100
=206

（3）0.72×0.8÷0.32   
=0.576÷0.32   
=1.8
             
（4）3.8×1.96-3.8×0.96
=3.8×（1.96-0.96）
=3.8×1
=3.8