(1)125×48 =125×(40+8) =125×40+125×8 =5000+1000 =6000; (2)17×83+17×17 =17×(83+17) =17×100 =1700; (3)0.82+1.7+8.3 =0.82+(1.7+8.3) =0.82+10 =10.82.