题目内容

递等式计算(能简算的要简算)
8
17
÷9+
1
9
×
8
17

3
4
-
1
6
)×(
5
9
+
2
3

9
20
÷[
1
2
×(
2
5
+
4
5
)].
(1)
8
17
÷9+
1
9
×
8
17

=
8
17
×
1
9
+
1
9
×
8
17
,.
=
8
17
×
1
9
×
2,
=
16
153


(2)(
3
4
-
1
6
)×(
5
9
+
2
3
),
=(
9
12
-
2
12
)×(
5
9
+
6
9
),
=
7
12
×
11
9

=
77
108


(3)
9
20
÷[
1
2
×(
2
5
+
4
5
)],
=
9
20
÷[
1
2
×
6
5
],
=
9
20
÷
3
5

=
9
20
×
5
3

=
3
4
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