题目内容

计算下列各题,能简算的要简算.
(1)
4
5
+(
3
8
-
1
4

(2)2-
3
7
-
4
7

(3)
5
8
-
1
3
+
5
12

(4)38.7-7.84÷1.4
(5)
5
12
-(
1
12
-
1
2

(6)8.8-2.5×1.8.
(1)
4
5
+(
3
8
-
1
4
),
=
4
5
+(
3
8
-
2
8
),
=
4
5
+
1
8

=
32
40
+
5
40

=
37
40


(2)2-
3
7
-
4
7

=2-(
3
7
+
4
7
),
=2-1,
=1;

(3)
5
8
-
1
3
+
5
12

=
15
24
-
8
24
+
10
24

=
7
24
+
10
24

=
17
24


(4)38.7-7.84÷1.4,
=38.7-5.6,
=33.1;

(5)
5
12
-(
1
12
-
1
2
),
=
5
12
-(
1
12
-
6
12
),
=
5
12
-(-
5
12
),
=
5
12
+
5
12

=
10
12

=
5
6


(6)8.8-2.5×1.8,
=8.8-4.5,
=4.3.
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