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一、选择题:本大题满分共30分,其中每小题满分5分,合计25分.从第3～5题中,自选一题,提供两种解法,解答正确者加5分.要求每道小题的每种解法都要提供详细解答过程,否则该题得0分.
First, the multiple-choice questions: This big topic score a total of 30 points, in which each small topic out of 5 points, a total of 25 points. From the 3rd to 5th questions, self-selection, provide two solutions, answer the correct plus 5 points. Each solution to each question must provide a detailed answer process, otherwise the question would score 0 points.