问题 解答题

3.26×4.25+5.75×3.26

4.65÷(4.65×2.5)

18.1-2.78-7.22

4.5×9.9.

答案

(1)3.26×4.25+5.75×3.26,

=3.26×(4.25+5.75),

=3.26×10,

=32.6;

(2)4.65÷(4.65×2.5),

=4.65÷4.65÷2.5,

=1÷2.5,

=0.4;

(3)18.1-2.78-7.22,

=18.1-(2.78+7.22),

=18.1-10,

=8.1;

(4)4.5×9.9,

=4.5×(10-0.1),

=4.5×10-4.5×0.1,

=45-0.45,

=44.55.

单项选择题
单项选择题