问题 解答题
灵活计算,能用简便方法的要简算.
10.1×85125×9.3×0.0843.72×7.9+2.1×43.27
93÷0.25÷42.3+3.91÷(22-19.7)7.92×6-18.45÷3
6.78+6.78×9918-(1.4+1.25×2.4)0.8×[13-(3.12+5.28)].
答案

(1)10.1×85,

=(10+0.1)×85,

=850+8.5,

=858.5;

(2)125×9.3×0.08,

=125×0.08×9.3,

=10×9.3,

=93;

(3)43.72×7.9+2.1×43.27,

=43.72×(7.9+2.1),

=43.72×10,

=437.2;

(4)93÷0.25÷4,

=93÷(0.25×4),

=93÷1,

=93;

(5)2.3+3.91÷(22-19.7),

=2.3+3.91÷2.3,

=2.3+1.7,

=4;

(6)7.92×6-18.45÷3,

=47.52-6.15,

=41.37;

(7)6.78+6.78×99,

=6.78×(1+99),

=6.78×100,

=678;

(8)18-(1.4+1.25×2.4),

=18-(1.4+1.25×8×0.3),

=18-(1.4+3),

=18-4.4,

=13.6;

(9)0.8×[13-(3.12+5.28)],

=0.8×[13-8.4],

=0.8×4.6,

=3.68.

填空题
单项选择题 案例分析题