观察下列各题 1＋3 = 4 = 22 1＋3＋5 = 9 = 32 1＋3＋5

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 =         .

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解析:
略

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观察下列各题 1＋3 = 4 = 22 1＋3＋5 = 9 = 32 1＋3＋5

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