问题 解答题

下面各题,怎样简便就怎样算.

450-225÷5+135

25×71×4

99×425

101×79-79

304+306÷17-298.

答案

(1)450-225÷5+135,

=450-45+135,

=405+135,

=540;

(2)25×71×4,

=25×4×71,

=100×71,

=7100;

(3)99×425,

=(100-1)×425,

=100×425-1×425,

=42500-425,

=42075;

(4)101×79-79,

=(101-1)×79,

=100×79,

=7900;

(5)304+306÷17-298,

=304+18-298,

=322-298,

=24.

单项选择题
单项选择题