题目内容
能简算的要简便计算.
6-
|
|
|
|
分析:(1)根据减法的性质简算;
(2)运用加法结合律以及减法的性质简算;
(3)先去括号,再运用加法交换律简算;
(4)根据减法的性质简算.
(2)运用加法结合律以及减法的性质简算;
(3)先去括号,再运用加法交换律简算;
(4)根据减法的性质简算.
解答:解:(1)6-
-
,
=6-(
+
),
=6-1,
=5;
(2)
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0;
(3)
-(
-
),
=
-
+
,
=
+
-
,
=1-
,
=
;
(4)
-(
+
),
=
-
-
,
=
-
,
=
.
| 3 |
| 11 |
| 8 |
| 11 |
=6-(
| 3 |
| 11 |
| 8 |
| 11 |
=6-1,
=5;
(2)
| 11 |
| 14 |
| 3 |
| 5 |
| 3 |
| 14 |
| 2 |
| 5 |
=(
| 11 |
| 14 |
| 3 |
| 14 |
| 3 |
| 5 |
| 2 |
| 5 |
=1-1,
=0;
(3)
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=1-
| 2 |
| 5 |
=
| 3 |
| 5 |
(4)
| 5 |
| 9 |
| 2 |
| 9 |
| 1 |
| 6 |
=
| 5 |
| 9 |
| 2 |
| 9 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 6 |
点评:本题考查了简单分数加减混合运算,要注意分析式中数据,运用合适的简便方法计算.
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