题目内容
(1)
|
(2)
|
(3)5-1
| ||||||||||||||||||
(4)
|
(5)2
|
(6)
|
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.
(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)
+
-
,
=
-
,
=
;
(2)
-
+
,
=
+
,
=
;
(3)5-1
-
,
=5-(1
+
),
=5-2,
=3;
(4)
-(
+
),
=
-
,
=
;
(5)2
-(
+
),
=2
-
-
,
=2-
,
=1
;
(6)
+
-
,
=
-
,
=1.
(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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