问题 解答题
用简便方法计算.
0.9999×1.3-0.1111×2.70.0495×2500+495×0.24+51×4.95.
答案

(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.

单项选择题 B1型题
单项选择题 A型题