如题所述
第1个回答 2013-09-17
40.6*9.4+0.6
=40.6*9.4+(40.6-39.6)*0.6
=40.6*(9.4+0.6)-39.6*0.6
=406-(39.6+0.4)*0.6+0.4*0.6
=406-24+0.24
=382.24
2.23-2.23*0.8
=2.23*(1-0.8)
=2.23*0.2
=0.446
=40.6*9.4+(40.6-39.6)*0.6
=40.6*(9.4+0.6)-39.6*0.6
=406-(39.6+0.4)*0.6+0.4*0.6
=406-24+0.24
=382.24
2.23-2.23*0.8
=2.23*(1-0.8)
=2.23*0.2
=0.446
