题目内容
(2012?团风县模拟)计算(能简算的要简算.)
|
|
7-(
| ||||||||||||||||||||
1
|
|
| ||||||||||||||||||||
5-
|
|
|
分析:(1)先通分,再进行计算;
(2)先算括号里的加法,再算括号外的加法;
(3)先算括号里的减法,再算括号外的减法;
(4)运用减法的运算定律进行简算;
(5)运用加法的交换律、结合律进行简算;
(6)先通分,再进行计算;
(7)运用减法的运算定律进行简算;
(8)运用加法的结合律进行简算;
(9)先算括号里的减法,再算括号外的减法.
(2)先算括号里的加法,再算括号外的加法;
(3)先算括号里的减法,再算括号外的减法;
(4)运用减法的运算定律进行简算;
(5)运用加法的交换律、结合律进行简算;
(6)先通分,再进行计算;
(7)运用减法的运算定律进行简算;
(8)运用加法的结合律进行简算;
(9)先算括号里的减法,再算括号外的减法.
解答:解:(1)
-
+
,
=
+
,
=
;
(2)
+(
+
),
=
+(
+
),
=
+
,
=
;
(3)7-(
-
),
=7-
,
=6
;
(4)1
-
-
,
=1
-(
+
),
=1
-1,
=
;
(5)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;.
(6)
+
-
,
=
-
,
=
;
(7)5-
-
,
=5-(
+
),
=5-1,
=4;
(8)
+
+
,
=
+(
+
),
=
+1,
=1
;
(9)
-(
-
),
=
-
,
=
.
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 7 |
| 12 |
| 1 |
| 3 |
=
| 11 |
| 12 |
(2)
| 23 |
| 28 |
| 13 |
| 14 |
| 2 |
| 7 |
=
| 23 |
| 28 |
| 13 |
| 14 |
| 2 |
| 7 |
=
| 23 |
| 28 |
| 17 |
| 14 |
=
| 57 |
| 28 |
(3)7-(
| 3 |
| 4 |
| 2 |
| 5 |
=7-
| 7 |
| 20 |
=6
| 13 |
| 20 |
(4)1
| 3 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
=1
| 3 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
=1
| 3 |
| 7 |
=
| 3 |
| 7 |
(5)
| 5 |
| 8 |
| 9 |
| 17 |
| 3 |
| 8 |
| 8 |
| 17 |
=(
| 5 |
| 8 |
| 3 |
| 8 |
| 9 |
| 17 |
| 8 |
| 17 |
=1+1,
=2;.
(6)
| 5 |
| 9 |
| 2 |
| 3 |
| 15 |
| 18 |
=
| 11 |
| 9 |
| 15 |
| 18 |
=
| 7 |
| 18 |
(7)5-
| 3 |
| 7 |
| 4 |
| 7 |
=5-(
| 3 |
| 7 |
| 4 |
| 7 |
=5-1,
=4;
(8)
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 6 |
=1
| 1 |
| 6 |
(9)
| 5 |
| 9 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 5 |
| 9 |
| 1 |
| 4 |
=
| 11 |
| 36 |
点评:考查了分数四则混合运算的顺序,灵活运用运算定律进行简算.
练习册系列答案
相关题目