用简便方法计算. 0.9999×1.3-0.1111×2.70.0495×2500+495×0.24+51×4.95.
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解:(1)0.9999×1.3-0.1111×2.7,
=0.1111×11.7-0.1111×2.7,
=0.1111×(11.7-2.7),
=0.1111×9,
=0.9999;
(2)0.0495×2500+495×0.24+51×4.95,
=4.95×25+4.95×24+51×4.95,
=4.95×(25+24+51),
=4.95×100,
=495.
解析分析:(1)0.9999×1.3-0.1111×2.7,转化为:0.1111×11.7-0.1111×2.7,再运用乘法分配律进行简算;(2)0.0495×2500+495×0.24+51×4.95,转化为:4.95×25+4.95×24+51×4.95,再运用乘法分配律进行简算.
点评:此题了、考查的目的是运用“转化”的思想和方法,使复杂的运算转化为简单的运算.