题目内容

(1)
3
4
+
5
8
-
7
16
(2)
7
8
-
1
4
+
4
9
(3)5-1
3
4
-
1
4
(4)
14
15
-(
1
4
+
3
8
(5)2
11
14
-(
11
14
+
4
5
(6)
1
2
+
4
5
-
3
10
分析:(1)按照从左向右的顺序进行计算;
(2)按照从左向右的顺序进行计算;
(3)根据连减的性质进行计算;
(4)先算加法,再算减法;
(5)根据连减的性质进行计算;
(6)按照从左向右的顺序进行计算.
解答:解:
(1)
3
4
+
5
8
-
7
16

=
11
8
-
7
16

=
15
16


(2)
7
8
-
1
4
+
4
9

=
5
8
+
4
9

=
77
72


(3)5-1
3
4
-
1
4

=5-(1
3
4
+
1
4
),
=5-2,
=3;

(4)
14
15
-(
1
4
+
3
8
),
=
14
15
-
5
8

=
37
120


(5)2
11
14
-(
11
14
+
4
5
),
=2
11
14
-
11
14
-
4
5

=2-
4
5

=1
1
5


(6)
1
2
+
4
5
-
3
10

=
13
10
-
3
10

=1.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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