1+2+3+4+5+...+97+98+99+.+9998+9999=?
1+2+3+4+5+...+97+98+99+.+9998+9999=?
数学人气：385 ℃时间：2020-03-29 06:58:07
优质解答
（1+9999）*9999/2=49995000
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