| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
| 17 |
| 72 |
=1-（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
=1-
| 1 |
| 2 |
| 1 |
| 9 |
=
| 1 |
| 2 |
| 1 |
| 9 |
=
| 11 |
| 18 |
故答案为：
| 11 |
| 18 |
计算：1-5/6+7/12-9/20+11/30-13/42+15/56-17/72=_．
计算：1-
+
-
+
-
+
-
=______．
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
| 17 |
| 72 |
数学人气：705 ℃时间：2019-08-17 17:27:30
优质解答
1-
+
-
+
-
+
-
，
=1-（
+
）+（
+
）-（
+
）+（
+
）-（
-
）+（
-
）-（
-
），
=1-
+
，
=
+
，
=
．
故答案为：
．
=1-（
=1-
=
=
故答案为：
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