题目内容
计算.(后两题要简算)
|
| 8
|
|
考点:分数的加法和减法
专题:运算顺序及法则
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)根据加法交换律和结合律进行简算;
(4)根据减法的性质进行简算.
(2)按照从左向右的顺序进行计算;
(3)根据加法交换律和结合律进行简算;
(4)根据减法的性质进行简算.
解答:
解:(1)
-
+
=
+
=
;
(2)
-
+
=
+
=
;
(3)8
+5
-6
+0.75
=(8
-6
)+(5
+0.75)
=2+6
=8;
(4)
-(
-
)
=
-
+
=0+
=
.
5 |
6 |
3 |
4 |
2 |
3 |
=
1 |
12 |
2 |
3 |
=
3 |
4 |
(2)
4 |
3 |
1 |
8 |
7 |
12 |
=
29 |
24 |
7 |
12 |
=
43 |
24 |
(3)8
17 |
23 |
1 |
4 |
17 |
23 |
=(8
17 |
23 |
17 |
23 |
1 |
4 |
=2+6
=8;
(4)
8 |
9 |
8 |
9 |
9 |
25 |
=
8 |
9 |
8 |
9 |
9 |
25 |
=0+
9 |
25 |
=
9 |
25 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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