【解析】
方程两边同乘以-2，得1-+2（-2）=1， ············································ 2分
即1-+2-4=1，···················································································· 4分
解得=4．···························································································· 5分
经检验， =4是原方程的根．···································································· 6分
【解析】略
分）计算：
－4cos30°－(
－1)
+2－1
的两根为
、
，则
的值为
.
和点
关于
轴对称，则
的值为
.
.