题目内容
脱式计算(能简算的要简算)
|
|
|
|
分析:(1)按照从左到右顺序解答,
(2)运用加法交换律,化原式为
+
+
,再按照从左到右顺序解答.
(3)按照从左到右顺序解答,
(4)按照从左到右顺序解答.
(2)运用加法交换律,化原式为
| 8 |
| 9 |
| 1 |
| 9 |
| 2 |
| 3 |
(3)按照从左到右顺序解答,
(4)按照从左到右顺序解答.
解答:解:(1)
-
+
,
=
+
,
=1
;
(2)
+
+
,
=
+
+
,
=1+
,
=1
;
(3)
-
+
,
=
+
,
=
;
(4)
+
+
+
,
=
+
+
,
=2+
,
=2
.
| 4 |
| 5 |
| 1 |
| 10 |
| 1 |
| 3 |
=
| 7 |
| 10 |
| 1 |
| 3 |
=1
| 1 |
| 30 |
(2)
| 8 |
| 9 |
| 2 |
| 3 |
| 1 |
| 9 |
=
| 8 |
| 9 |
| 1 |
| 9 |
| 2 |
| 3 |
=1+
| 2 |
| 3 |
=1
| 2 |
| 3 |
(3)
| 5 |
| 8 |
| 5 |
| 10 |
| 1 |
| 6 |
=
| 1 |
| 8 |
| 1 |
| 6 |
=
| 7 |
| 24 |
(4)
| 9 |
| 10 |
| 3 |
| 10 |
| 8 |
| 10 |
| 3 |
| 10 |
=
| 12 |
| 10 |
| 8 |
| 10 |
| 3 |
| 10 |
=2+
| 3 |
| 10 |
=2
| 3 |
| 10 |
点评:本题主要考查了学生对于分数加、减法以及加法交换律知识掌握.
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