1+3+5+7+9+11+···········199=()×()=()2
1+3+5+7+9+11+···········199=()×()=()2
数学人气：737 ℃时间：2020-04-09 14:05:11
优质解答
1+3+5+7+9+11+···········199=（1+199）50=200X50=10000=(100)2
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