题目内容
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 31×33 |
（234+
| 1 |
| 232 |
| 1 |
| 233 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
156
| 11 |
| 20 |
| 1 |
| 31 |
24×
| 51 |
| 43 |
| 19 |
| 43 |
（1）
+
+
+…+
=
×（1-
+
-
+…+
-
）
=
×（1-
）
=
×
=
；
（2）（234+
）×
=（233+1+
）×
=（233+
）×
=1+
=1
；
（3）
+
+
+
+
=
-
+
-
+…+
-
=
-
=
；
（4）156
×
=（155+
）×
=155×
+
×
=5+
=5
；
（5）24×
+51×
=24×
+19×
=（24+19）×
=43×
=51．
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 31×33 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 31 |
| 1 |
| 33 |
=
| 1 |
| 2 |
| 1 |
| 33 |
=
| 1 |
| 2 |
| 32 |
| 33 |
=
| 16 |
| 33 |
（2）（234+
| 1 |
| 232 |
| 1 |
| 233 |
=（233+1+
| 1 |
| 232 |
| 1 |
| 233 |
=（233+
| 233 |
| 232 |
| 1 |
| 233 |
=1+
| 1 |
| 232 |
=1
| 1 |
| 232 |
（3）
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 7 |
=
| 1 |
| 2 |
| 1 |
| 7 |
=
| 5 |
| 14 |
（4）156
| 11 |
| 20 |
| 1 |
| 31 |
=（155+
| 31 |
| 20 |
| 1 |
| 31 |
=155×
| 1 |
| 31 |
| 31 |
| 20 |
| 1 |
| 31 |
=5+
| 1 |
| 20 |
=5
| 1 |
| 20 |
（5）24×
| 51 |
| 43 |
| 19 |
| 43 |
=24×
| 51 |
| 43 |
| 51 |
| 43 |
=（24+19）×
| 51 |
| 43 |
=43×
| 51 |
| 43 |
=51．
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