问题 解答题
简算:
11
21
×
1
8
+
10
21
÷8
(15-15×
4
5
)×
7
24
(34+
34
47
)÷17
5
6
+
2
9
)×
4
5
÷
19
20
答案

(1)

11
21
×
1
8
+
10
21
÷8,

=

11
21
×
1
8
+
10
21
×
1
8

=

1
8
×(
11
21
+
10
21
),

=

1
8
×1,

=

1
8

(2)(15-15×

4
5
)×
7
24

=3×

7
24

=

7
8

(3)(34+

34
47
)÷17,

=34÷17+

34
47
÷17,

=2+

34
47
×
1
17

=2+

2
47

=2

2
47

(4)(

5
6
+
2
9
)×
4
5
÷
19
20

=(

45
54
+
12
54
)×
4
5
×
20
19

=

57
54
×
16
19

=

8
9

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