问题 解答题
用简便方法计算下列各题
①7
5
6
+3
9
10
+2
1
6
+6
1
10
8
13
÷7+
1
7
×
6
13
③2.5×0.125×80×4.
答案

(1)7

5
6
+3
9
10
+2
1
6
+6
1
10

=(7

5
6
+2
1
6
)+(3
9
10
+6
1
10
),

=10+10,

=20;

(2)

8
13
÷7+
1
7
×
6
13

=

8
13
×
1
7
+
1
7
×
6
13

=

1
7
×(
8
13
+
6
13
),

=

1
7
×
14
13

=

2
13

(3)2.5×0.125×80×4,

=(2.5×4)×(0.125×80),

=10×10,

=100.

单项选择题
单项选择题