（本題滿分6分）解方程:
解：方程兩邊同乘以-2，得1-
+2（
-2）=1， ············································ 2分
即1-+2
-4=1，···················································································· 4分
解得=4．···························································································· 5分
經檢驗， =4是原方程的根．···································································· 6分
解析:略
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