题目内容
计算下面各题.(能简算的要简算)
+
-(
-
)
-
+
-
+
+
-
.
| 5 |
| 6 |
| 11 |
| 14 |
| 5 |
| 6 |
| 4 |
| 9 |
| 1 |
| 3 |
| 4 |
| 5 |
| 4 |
| 11 |
| 1 |
| 5 |
| 7 |
| 11 |
| 3 |
| 4 |
| 6 |
| 13 |
| 7 |
| 13 |
| 1 |
| 4 |
分析:(1)先通分,再相加;
(2)先算小括号里面的减法,再算小括号里面的减法;
(3)根据加法交换律和减法的性质简算;
(4)根据加法交换律和加法结合律简算.
(2)先算小括号里面的减法,再算小括号里面的减法;
(3)根据加法交换律和减法的性质简算;
(4)根据加法交换律和加法结合律简算.
解答:解:
(1)
+
,
=
+
,
=
;
(2)
-(
-
),
=
-
,
=
;
(3)
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0;
(4)
+
+
-
,
=(
-
)+(
+
),
=
+1,
=1
.
(1)
| 5 |
| 6 |
| 11 |
| 14 |
=
| 35 |
| 42 |
| 33 |
| 42 |
=
| 34 |
| 21 |
(2)
| 5 |
| 6 |
| 4 |
| 9 |
| 1 |
| 3 |
=
| 5 |
| 6 |
| 1 |
| 9 |
=
| 13 |
| 18 |
(3)
| 4 |
| 5 |
| 4 |
| 11 |
| 1 |
| 5 |
| 7 |
| 11 |
=(
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 11 |
| 7 |
| 11 |
=1-1,
=0;
(4)
| 3 |
| 4 |
| 6 |
| 13 |
| 7 |
| 13 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 6 |
| 13 |
| 7 |
| 13 |
=
| 1 |
| 2 |
=1
| 1 |
| 2 |
点评:本题考查了基本的分数的加减混合运算,要注意分析数据,选择合适的简算方法简算.
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