题目内容
脱式运算,能简便的要用简便方法计算.
|
|
1-
|
分析:(1)先计算减法,再计算加法;
(2)根据加法交换律和结合律进行简算;
(3)1连续减去
与
,等于减去
与
的和.
(2)根据加法交换律和结合律进行简算;
(3)1连续减去
| 5 |
| 6 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 6 |
解答:解:
(1)
-
+
,
=
+
,
=
;
(2)
+
+
+
,
=(
+
)+(
+
),
=
+1;
=1
;
(3)1-
-
,
=1-(
+
),
=1-1,
=0.
(1)
| 4 |
| 5 |
| 11 |
| 15 |
| 3 |
| 10 |
=
| 1 |
| 15 |
| 3 |
| 10 |
=
| 11 |
| 30 |
(2)
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
=(
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 1 |
| 2 |
=1
| 1 |
| 2 |
(3)1-
| 5 |
| 6 |
| 1 |
| 6 |
=1-(
| 5 |
| 6 |
| 1 |
| 6 |
=1-1,
=0.
点评:本题主要考查分数加减法的混合运算,要根据运算顺序进行计算,能简算的要简算.
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