问题 解答题
计算下面各题,能用简便算法的用简便算法
12.25-3.1+0.85-6.172.65×1.7+1.35×1.76.9×10.10.125×25×80×0.4.
答案

(1)12.25-3.1+0.85-6.17,

=12.25+0.85-3.1-6.17,

=13.1-3.1-6.17,

=10-6.17,

=3.83;

(2)2.65×1.7+1.35×1.7,

=(2.65+1.35)×1.7,

=4×1.7,

=6.8;

(3)6.9×10.1,

=6.9×10+6.9×0.1,

=69+0.69,

=69.69;

(4)0.125×25×80×0.4,

=(0.125×80)×(25×0.4),

=10×10,

=100.

单项选择题
问答题 简答题