1111111111/3333333333+2222222222/4444444444
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1/ 1-2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10.
2/
1+4+7+10+.........+100=?
3/
1111111111/3333333333+2222222222/4444444444=?