问题 解答题
简便计算.
2.5×1.25×32
13
6
÷
7
5
-
1
6
×
5
7

7
12
×13+
11
12
×7.
答案

(1)2.5×1.25×32,

=2.5×1.25×4×8,

=2.5×4×(125×8),

=10×1000,

=10000;

(2)

13
6
÷
7
5
-
1
6
×
5
7

=

13
6
×
5
7
-
1
6
×
5
7

=(

13
6
-
1
6
)×
5
7

=2×

5
7

=

10
7

(3)

7
12
×13+
11
12
×7,

=

7
12
×13+
7
12
×11,

=(13+11)×

7
12

=24×

7
12

=14.

单项选择题
单项选择题