Question

脱式计算，能用简便方法计算用简便方法．6.4×4.5+3.6×4.5 &...

脱式计算，能用简便方法计算用简便方法．6.4×4.5+3.6×4.5 16.38÷0.36-4.80.85+0.2×1.35 4.38÷0.125÷0.8．

Answer 1

（1）6.4×4.5+3.6×4.5
=（6.4+3.6）×4.5
=10×4.5
=45；            
              
（2）16.38÷0.36-4.8
=45.5-4.8
=40.7；

（3）0.85+0.2×1.35
=0.85+0.27
=1.12；        
                    
（4）4.38÷0.125÷0.8
=4.38÷（0.125×8）
=4.38÷1
=4.38．