问题 解答题
用简便方法计算
2.25×5.8+2.75
4×5.84×38×25
13.52-4.7-5.3+6.4822.5-4.5÷18.
答案

(1)2.25×5.8+2.75×5.8

=(2.25+2.75)×5.8

=5×5.8

=29;

(2)4×5.84×38×25

=5.84×(4×25)×38

=5.84×100×38

=22192;

(3)13.52-4.7-5.3+6.48

=13.52+6.48-(4.7+5.3)

=20-10

=10;

(4)22.5-4.5÷18

=22.5-4.5÷(9×2)

=22.5-4.5÷9÷2

=22.5-0.5÷2

=22.5-0.25

=22.25.

单项选择题
单项选择题