问题 解答题
用简便方法计算.
24×
2
7
×
5
72
×21
8
13
÷7+
1
7
×
6
13

46×
7
45
11.58-(7
5
11
+1.58)
答案

(1)24×

2
7
×
5
72
×21

=21×

2
7
×24×
5
72

=6×

5
3

=10;

(2)

8
13
÷7+
1
7
×
6
13

=

8
13
×
1
7
+
1
7
×
6
13

=(

8
13
+
6
13
)×
1
7

=

14
13
×
1
7

=

2
13

(3)46×

7
45

=(45+1)×

7
45

=45×

7
45
+1×
7
45

=7+

7
45

=7

7
45

(4)11.58-(7

5
11
+1.58)

=11.58-1.58-7

5
11

=10-7

5
11

=2

6
11

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