1+2+3+4.10000000=?
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1+2+3+4.10000000=?1+2+3+4.10000000=?1+2+3+4.10000000=?1+2+3+4.10000000=(1+10000000)*10000000/2=10000
1+2+3+4.10000000=?
1+2+3+4.10000000=?
1+2+3+4.10000000=?
1+2+3+4.10000000
=(1+10000000)*10000000/2
=10000001*5000000
=50000005000000
1+2+3+4......10000000=50000005000000 五亿亿零五百万
﹙10000000+1﹚×5000000
(1+10000000)*10000000/2=5.0000005*10^13