问题 解答题
计算下列各题、能简便的要简便计算
(1)3.2×1.25+4.8×1
1
4
(2)(15-14×
4
7
)×
8
21
(3)28.2×44.54+4.454×718(4)
8
15
×
5
16
+
5
27
÷
10
9
答案

(1)3.2×1.25+4.8×1

1
4

=3.2×1.25+4.8×1.25,

=(3.2+4.8)×1.25,

=8×1.25,

=10;

(2)(15-14×

4
7
)×
8
21

=(15-8)×

8
21

=7×

8
21

=

8
3

(3)28.2×44.54+4.454×718,

=28.2×44.54+44.54×71.8,

=(28.2+71.8)×44.54,

=100×44.54,

=4454;

(4)

8
15
×
5
16
+
5
27
÷
10
9

=

1
6
+
1
6

=

1
3

单项选择题
单项选择题