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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