题目内容

2-(
1
10
+
3
10
)
=
(
3
4
-
3
4
×
2
5
)÷
1
5
×5
=
1
5
×
1
2
÷
1
5
×
1
2
=
(
1
4
+
5
8
)÷(1
3
4
-
7
8
)
=
1
3
÷
5
6
×
9
22
÷
5
14
=
[
3
4
÷(
4
5
+
1
4
)-
4
7
]×
9
11
=
(1)2-(
1
10
+
3
10
),
=2-
2
5
,
=1
3
5
;

(2)(
3
4
-
3
4
×
2
5
)÷
1
5
×5
,
=(
3
4
-
3
10
)÷
1
5
×
5,
=
9
20
÷
1
5
×5,
=
9
4
×
5,
=11.25;

(3)
1
5
×
1
2
÷
1
5
×
1
2
,
=(
1
5
÷
1
5
)×(
1
2
×
1
2
),
=1×
1
4
,
=
1
4
;

(4)(
1
4
+
5
8
)÷(1
3
4
-
7
8
)
,
=
7
8
÷
7
8
,
=1;

(5)
1
3
÷
5
6
×
9
22
÷
5
14
,
=
2
5
×
9
22
÷
5
14
,
=
9
55
÷
5
14
,
=
126
275
;

(6)[
3
4
÷(
4
5
+
1
4
)-
4
7
]×
9
11
,
=[
3
4
÷
21
20
-
4
7
]×
9
11
,
=[
5
7
-
4
7
]×
9
11
,
=
1
7
×
9
11
,
=
9
77
.
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