Which of the following is true of teacher's correction of his student's writing errors?

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• Which of the following is true of teacher's correction of his student's writing errors?
• Which of the following is true of teacher's correction of his student's writing errors?
• 已知等比数列{an}中，a1=64，公比q≠1，a2，a3，a4又分别是某等差数列的第7项、第3项和第1项． （1）求数列{an}的通项公式； （2）设bn=log2an，求数列{|bn|}的前n项和Tn．
• 公式v²-v0²=2ax,竖直上抛,那么末速度为0,代入就是-v0=2gh,可为什么题里用的是v0²=2gh呢?