1 + 3 = (1 + 3) * 2 / 2; 1 + 3 + 5 = (1 + 5) * 3 / 2; 1 + 3 + 5 + 7 = (1 + 7) * 4 / 2. Please summarize the general formula for calculating the above formula

1+3＝（1+3）*2/2
===》1+（2n+1）=【1+（2n+1）】*n/2
Mathematical problems, LZ use their own brains better

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