用简便方法计算下面各题．43.6＋9.8＋6.4；7.3×0.25×8；2.31×1.5＋1.5×7.69．
方法
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| 用简便方法计算下面各题． 43.6+9.8+6.4；7.3×0.25×8；2.31×1.5+1.5×7.69． |
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①43.6+9.8+6.4
=（43.6+6.4）+9.8
=50+9.8
=59.8；②7.3×0.25×8
=7.3×（0.25×8）
=7.3×2
=14.6；③2.31×1.5+1.5×7.69
=（2.31+7.69）×1.5
=10×1.5
=15．