题目

观察下列各题 1＋3 =" 4" = 22             1＋3＋5 =" 9" = 32 1＋3＋5＋7 =" 16" = 42     1＋3＋5＋7＋9 =" 25" = 52……根据上面各式的规律，请直接写出1＋3＋5＋7＋9＋…＋99 =         . 答案：解析:略

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