题目内容

用递等式计算.
4
5
×
5
18
+
3
7
+
7
9

7
8
÷[(
7
8
-
3
4
)×
4
5
]
7
3
-(
3
5
÷
9
20
+
1
3
)
6×(
2
15
+
1
12
)-
1
8
.
4
5
×
5
18
+
3
7
+
7
9

=
2
9
+
7
9
+
3
7
,
=1+
3
7
,
=1
3
7
;

7
8
÷[(
7
8
-
3
4
)×
4
5
]
=
7
8
÷[
1
8
×
4
5
],
=
7
8
×10,
=
35
4
;

7
3
-(
3
5
÷
9
20
+
1
3
)
=
7
3
-(
4
3
+
1
3
),
=
7
3
-
5
3
,
=
2
3
;

6×(
2
15
+
1
12
)-
1
8
.
=6×
13
60
-
1
8
,
=
13
10
-
1
8
,
=
47
40
.
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