问题 解答题

用简便方法计算.

25×1.25×32

(3.75+4.1+2.35)×9.8.

答案

(1)25×1.25×32

=25×1.25×4×8,

=(25×4)×(1.25×8),

=100×10,

=1000;

(2)(3.75+4.1+2.35)×9.8

=(3.75+2.35+4.1)×9.8,

=(6.1+4.1)×9.8,

=10.2×9.8,

=10.2×(10-0.2),

=10.2×10-10.2×0.2,

=102-2.04,

=99.96.

问答题 简答题
问答题 简答题