用简便方法计算下面各题．0.25×0.35×400.169×500×0.23.76×3.2+3.76×6.8+3.76100.1-903.6÷18．

Question

用简便方法计算下面各题．
0.25×0.35×40             
0.169×500×0.2       
3.76×3.2+3.76×6.8+3.76
100.1-903.6÷18．

Answer 1

（1）0.25×0.35×40       
=0.25×40×0.35
=10×0.35
=3.5      

（2）0.169×500×0.2    
=0.169×（500×0.2）
=0.169×100
=16.9
   
（3）3.76×3.2+3.76×6.8+3.76
=3.76×（3.2+6.8）+3.76
=3.76×10+3.76
=37.6+3.76
=41.36

（4）100.1-903.6÷18
=100.1-50.2
=49.9