题目内容
脱式计算（能简便算的要简算，写出主要步骤）
①3.6-2.8+7.4-7.2
②
÷23+
×
+
③（
+
）÷
-
④18÷[
+（
-
）]．
①3.6-2.8+7.4-7.2
②
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
③（
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 5 |
| 17 |
| 18 |
④18÷[
| 5 |
| 6 |
| 5 |
| 8 |
| 1 |
| 3 |
①3.6-2.8+7.4-7.2
=3.6+7.4-（2.8+7.2）
=11-10
=1；
②
÷23+
×
+
=
×
+
×
+
×1
=（
+
+1）×
=2×
=
；
③（
+
）÷
-
=
÷
-
=
-
=
；
④18÷[
+（
-
）]
=18÷（
+
）
=18÷
=16．
=3.6+7.4-（2.8+7.2）
=11-10
=1；
②
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
=（
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=2×
| 1 |
| 23 |
=
| 2 |
| 23 |
③（
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 5 |
| 17 |
| 18 |
=
| 5 |
| 6 |
| 3 |
| 5 |
| 17 |
| 18 |
=
| 25 |
| 18 |
| 17 |
| 18 |
=
| 4 |
| 9 |
④18÷[
| 5 |
| 6 |
| 5 |
| 8 |
| 1 |
| 3 |
=18÷（
| 5 |
| 6 |
| 7 |
| 24 |
=18÷
| 27 |
| 24 |
=16．
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