（2013•随州模拟）简算．①12.25−(327+2.25)②19×1.25×27×80．

Question

（2013•随州模拟）简算．
①12.25−(3(2)/(7)+2.25)
②(1)/(9)×1.25×27×80．

Answer 1

①12.25−(3(2)/(7)+2.25)
=12.25-2.25-3(2)/(7)  
=10-3(2)/(7)
=6(5)/(7)；

②(1)/(9)×1.25×27×80
=（(1)/(9)×27）×（1.25×80）
=3×100    
=300．