问题 解答题
简便计算:
7
8
×(1-75%)+
1
4
+0.25×
1
8
49.5×13.5+50.5×13-0.5×49.5.
答案

(1)

7
8
×(1-75%)+
1
4
+0.25×
1
8

=

7
8
×0.25+0.25+0.25×
1
8

=0.25×(

7
8
+1+
1
8
),

=0.25×2,

=0.5;

(2)49.5×13.5+50.5×13-0.5×49.5,

=49.5×13.5-0.5×49.5+50.5×13,

=49.5×(13.5-0.5)+50.5×13,

=49.5×13+50.5×13,

=(49.5+50.5)×13,

=100×13,

=1300.

单项选择题
单项选择题 案例分析题