Ta có:
1/2+1/6+...+1/9900
=1/1.2+1/2.3...+1/99.100
=1-1/2+1/2-1/3+1/3-...+1/99-1/100
=1-1/100
=99/100
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Các câu hỏi tương tự
1/2 + 1/6 + 1/12 + .... + 1/9900 + 1/10100
1/2+1/6+1/12+1/20+...+1/9900
1/2+1/6+1/12+1/20+1/30+...+1/9900
Tính B=1/2+1/6+1/12+1/20+1/30+...+1/9900
B=1/2+1/6+1/12+1/20+1/30+...+1/9900 = ?
Tính B= 1\2+1\6+1\12+1\20+1\30+...+1\9900
Tính:
1/2+1/6+1/12+1/20+1/30+...+1/9900
hay giup minh voi
B=1/2*x+1/2+1/6+1/12+...+1/9900=2
Tính :
B= 1/2+1/6+1/12+1/20+1/30+....+1/9900