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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