问题 解答题
计算下面各题
(1)1.25×2.4
(2)95×99+95
(3)
7
9
÷
11
5
+
2
9
×
5
11

(4)12.125-(12.125-8.6)
答案

(1)1.25×2.4

=1.25×0.8×3

=1×3

=3;

(2)95×99+95

=95×(99+1)

=95×100

=9500;

(3)

7
9
÷
11
5
+
2
9
×
5
11

=

7
9
×
5
11
+
2
9
×
5
11

=(

7
9
+
2
9
)×
5
11

=

5
11

(4)12.125-(12.125-8.6)

=12.125-12.125+8.6

=8.6.

单项选择题
问答题 简答题