下面各题，能简算的要简算。6.38-(1.38+2.28)= 15.7×9.9= 34
下面各题，能简算的要简算。6.38-(1.38+2.28)=15.7×9.9=34.82+(15.9+4.18)=46×0.57+54×0.57...
下面各题，能简算的要简算。6.38-(1.38+2.28)= 15.7×9.9= 34.82+(15.9+4.18)= 46×0.57+54×0.57
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6.38-(1.38+2.28）
=6.38-1.38-2.28
=5-2.28
=2.72
15.7×9.9
=15.7×（10-0.1）
=15.7×10-15.7×0.1
=157-1.57
=155.43
34.82+(15.9+4.18)
=34.82+4.18+15.9
=39+15.9
=54.9
46×0.57+54×0.57
=0.57×（46+54）
=0.57×100
=57
=6.38-1.38-2.28
=5-2.28
=2.72
15.7×9.9
=15.7×（10-0.1）
=15.7×10-15.7×0.1
=157-1.57
=155.43
34.82+(15.9+4.18)
=34.82+4.18+15.9
=39+15.9
=54.9
46×0.57+54×0.57
=0.57×（46+54）
=0.57×100
=57
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