题目内容

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
.
(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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