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(jīng)檢驗,
=4是原方程的根.···································································· 6分解析:
略