题目内容
(你+
+
+
)×(
+
+
+
)-(你+
+
+
+
)×(
+
+
)．
| 你 |
| 3 |
| 你 |
| 5 |
| 你 |
| 7 |
| 你 |
| 3 |
| 你 |
| 5 |
| 你 |
| 7 |
| 你 |
| 9 |
| 你 |
| 3 |
| 你 |
| 5 |
| 你 |
| 7 |
| 你 |
| 9 |
| 你 |
| 3 |
| 你 |
| 5 |
| 你 |
| 7 |
设
+
+
=a，
(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
)
=（1+a）×（a+
）-（1+a+
）×a
=a+
+a我+
a-a-a我-
a
=
．
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 7 |
(1+
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 7 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 7 |
=（1+a）×（a+
| 1 |
| 9 |
| 1 |
| 9 |
=a+
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
=
| 1 |
| 9 |
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