题目内容
计算:(用你喜欢的方法计算)
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1-
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分析:(1)、(2)、(3)先通分,再计算;
(4)根据加法交换律进行计算;
(5)根据连减的性质进行计算;
(6)先算减法,再算加法.
(4)根据加法交换律进行计算;
(5)根据连减的性质进行计算;
(6)先算减法,再算加法.
解答:解:
(1)
+
,
=
+
,
=
;
(2)
-
,
=
-
,
=
;
(3)
+
+
,
=
+
+
,
=2;
(4)
+
-
,
=
-
+
,
=
;
(5)1-
-
,
=1-(
+
),
=1-
,
=
;
(6)
-
+
,
=
+
,
=
.
(1)
| 2 |
| 3 |
| 1 |
| 4 |
=
| 8 |
| 12 |
| 3 |
| 12 |
=
| 11 |
| 12 |
(2)
| 8 |
| 9 |
| 5 |
| 6 |
=
| 16 |
| 18 |
| 15 |
| 18 |
=
| 1 |
| 18 |
(3)
| 5 |
| 6 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 5 |
| 6 |
| 3 |
| 6 |
| 4 |
| 6 |
=2;
(4)
| 8 |
| 9 |
| 4 |
| 5 |
| 8 |
| 9 |
=
| 8 |
| 9 |
| 8 |
| 9 |
| 4 |
| 5 |
=
| 4 |
| 5 |
(5)1-
| 2 |
| 7 |
| 3 |
| 7 |
=1-(
| 2 |
| 7 |
| 3 |
| 7 |
=1-
| 5 |
| 7 |
=
| 2 |
| 7 |
(6)
| 7 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 1 |
| 9 |
| 5 |
| 6 |
=
| 17 |
| 18 |
点评:分析好算式中的数据,选择合适的方法进行计算.
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