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1问题再现2011年云南省高三第一次统一检测结束后,很多老师和学生认为数学第20题的第二问:证明|f(x)|>g(x)+1/2是错误的,并给出了如下“证明”.这道题真的错了吗?我们先来看一些老师给出的证明.
1 Problem Reproduction After the first unifinication test of Yunnan Senior High School in 2011, many teachers and students think the second question in math 20 is: Proof | f (x) |> g (x) +1/2 is wrong, And gives the following “proof.” Is this a real mistake? Let’s start with some testimonies given by the teacher.