题目内容

能简算的要简算.
23-
8
9
×
3
4
÷
1
27

5
7
-
5
7
×
5
9

7
8
×
2
3
+
7
8
÷3
5÷[(
2
3
+
1
5
)×
1
13
]
4
25
×99+
4
25

7
8
x=
21
40
(解方程)
5
6
与
3
4
的差是它们和的几分之几?
(1)23-
8
9
×
3
4
÷
1
27
,
=23-
8
9
×
3
4
×27,
=23-18,
=5;

(2)
5
7
-
5
7
×
5
9
,
=
5
7
×(1-
5
9
),
=
5
7
×
4
9
,
=
20
63
;

(3)
7
8
×
2
3
+
7
8
÷3,
=
7
8
×
2
3
+
7
8
×
1
3
,
=
7
8
×(
2
3
+
1
3
),
=
7
8
×1,
=
7
8
;

(4)5÷[(
2
3
+
1
5
)×
1
13
],
=5÷[
13
15
×
1
13
],
=5÷
1
15
,
=75;

(5)
4
25
×99+
4
25
,
=
4
25
×(99+1),
=
4
25
×100,
=16;

(6)
7
8
x=
21
40
,
7
8
x×
8
7
=
21
40
×
8
7
,
x=
3
5
;

(7)(
5
6
-
3
4
)÷(
5
6
+
3
4
),
=
1
12
÷
19
12
,
=
1
12
×
12
9
,
=
1
9
.
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