nk 1时等式也成立,那么ak 1等于什么? 生:由aka1(k1) d可得ak 1a1(k1)1 d。 师:看来nk1时等式也成立,这样做对吗? 生:(齐答)不对。 学习必备欢迎下载 师:用数学归纳法证明数学命题时, 难点和关键都在第二步, 而这一步主要在于合理运用归纳假设,即以“n=k时命题成立”为条件,证明“证n=k+1时命...
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