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1数学公式×1.25+2.2×1数学公式

解:1×1.25+2.2×1
=1×1+2×1
=1×(1+2),
=1×4,
=×4,
=5.
分析:先讲1.25化成1,2.2化成2,再根据乘法分配律变为1×1+2×1进行计算.
点评:做计算题的关键是注意观察题中数据的特点,在运用合适的简便方法进行计算.
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