题目内容
脱式计算.
(1)
| (2)
| (3)1-(
| ||||||||||||||||||
(4)
| (5)
| (6)
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)从左向右进行计算;
(2)运用加法的交换律进行简算;
(3)先算小括号里的加法,再算括号外的减法;
(4)先算减法,再算加法;
(5)从左向右进行计算;
(6)从左向右进行计算.
(2)运用加法的交换律进行简算;
(3)先算小括号里的加法,再算括号外的减法;
(4)先算减法,再算加法;
(5)从左向右进行计算;
(6)从左向右进行计算.
解答:
解:(1)
+
-
=
-
=
;
(2)
-
+
=
+
-
=1-
=
;
(3)1-(
+
)
=1-
=
;
(4)
+
-
=
-
+
=0+
=
;
(5)
-
+
=
+
=
;
(6)
-
-
=
-
=
.
| 3 |
| 5 |
| 17 |
| 20 |
| 1 |
| 4 |
=
| 29 |
| 20 |
| 1 |
| 4 |
=
| 6 |
| 5 |
(2)
| 8 |
| 9 |
| 2 |
| 3 |
| 1 |
| 9 |
=
| 8 |
| 9 |
| 1 |
| 9 |
| 2 |
| 3 |
=1-
| 2 |
| 3 |
=
| 1 |
| 3 |
(3)1-(
| 3 |
| 8 |
| 1 |
| 6 |
=1-
| 13 |
| 24 |
=
| 11 |
| 24 |
(4)
| 3 |
| 7 |
| 5 |
| 13 |
| 3 |
| 7 |
=
| 3 |
| 7 |
| 3 |
| 7 |
| 5 |
| 13 |
=0+
| 5 |
| 13 |
=
| 5 |
| 13 |
(5)
| 7 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 1 |
| 9 |
| 5 |
| 6 |
=
| 17 |
| 18 |
(6)
| 4 |
| 5 |
| 3 |
| 8 |
| 1 |
| 6 |
=
| 17 |
| 40 |
| 1 |
| 6 |
=
| 31 |
| 120 |
点评:考查了分数四则混合运算.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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