下面各题怎样简便怎样算.
①0.91÷0.013×1.35÷0.05
②0.625×1.6+×3.4
③6.5×101.
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解:①0.91÷0.013×1.35÷0.05
=(0.91÷0.013)×(1.35÷0.05 ),
=70×27,
=1890;
②0.625×1.6+×3.4
=0.625×1.6+0.625×3.4,
=(1.6+3.4)×0.625,
=5×0.625,
=3.125;
③6.5×101
=6.5×(100+1),
=6.5×100+6.5×1,
=650+6.5,
=656.5.
解析分析:算式①根据乘法结合律计算即可;
算式②将式中的分数化为小数后,可根据乘法分配律进行计算;
算式③可将101拆分为100+1后,根据乘法分配律进行计算;
点评:当算式中同时含有分数与小数,要根据式中数据的特点灵活将它们互化,然后再进行计算.