题目内容
脱式计算.
1-
+
+
+
-
-(
-
)
-(
+
)
1-
| 3 |
| 4 |
| 5 |
| 18 |
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 8 |
| 9 |
| 4 |
| 5 |
| 7 |
| 10 |
| 13 |
| 20 |
| 9 |
| 10 |
| 1 |
| 6 |
| 2 |
| 3 |
分析:有小括号的先算小括号里面的,只有加和减的按照从左向右的运算顺序计算.
解答:解:(1)1-
+
,
=
+
,
=
;
(2)
+
+
-
,
=
+
-
,
=
-
,
=
;
(3)
-(
-
),
=
-
,
=
;
(4)
-(
+
),
=
-
,
=
.
| 3 |
| 4 |
| 5 |
| 18 |
=
| 1 |
| 4 |
| 5 |
| 18 |
=
| 19 |
| 36 |
(2)
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 8 |
| 9 |
=
| 4 |
| 5 |
| 2 |
| 5 |
| 8 |
| 9 |
=
| 6 |
| 5 |
| 8 |
| 9 |
=
| 14 |
| 45 |
(3)
| 4 |
| 5 |
| 7 |
| 10 |
| 13 |
| 20 |
=
| 4 |
| 5 |
| 1 |
| 20 |
=
| 3 |
| 4 |
(4)
| 9 |
| 10 |
| 1 |
| 6 |
| 2 |
| 3 |
=
| 9 |
| 10 |
| 5 |
| 6 |
=
| 1 |
| 15 |
点评:本题考查了基本的运算法则,注意运算的结果化成最简分数.
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