选择题只需找出正确的答案即可 ,对过程不作要求 ,因此在做选择题时 ,若能灵活运用取特殊值、数形结合、排除法、估算等非常规解法 ,则可起到事半功倍的效果。下面就以 2 0 0 2年高考数学卷 (理工农医类 )为例 ,谈谈选择题的非常规解法 .图 1(1)圆 (ｘ - 1) 2 +ｙ2 =1的圆心到 Multiple-choice questions only need to find out the correct answer, and there is no requirement on the process. Therefore, when selecting multiple questions, if you can flexibly use unconventional methods such as special value, combination of number and shape, elimination method, and estimation, you can do more with less. Effect. Take the example of the mathematics exam (technical agro-medical category) of the college entrance examination in 2002 as an example to talk about the unconventional solution of the multiple-choice questions. Figure 1(1) The circle (x - 1) 2 +y2 = 1