100000000=10000000000000
K
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Câu này con thấy đc
1+1+2+2+3+3+....+100000000+100000000=2(1+2+3+...+100000000)=2x100000000x100000001:2=100000000x100000001
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=1000000000000000000000000000000
Dai qua chuc ban hoc gioi