1/2+5/6+11/12+19/20ãããããã9701/9702+9899/9900
=1+1+â¦â¦+1-ï¼1/2+1/6+1/12+1/20+â¦â¦+1/9702+1/9900ï¼
=99-ï¼1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+â¦â¦+1/98-1/99+1/99-1/100ï¼
=99-ï¼1-1/100ï¼
=98.01
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