A=1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+...+1/(10*11)
A=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+...+1/10-1/11
A=1/2-1/11
A=9/22
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Các câu hỏi tương tự
Tính : A = 1/6 + 1/12 + 1/20 + 1/30 + 1/42 +...+1/90 + 1/110
A = 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90 + 1/110=?
1/6+1/12+1/20+1/30+1/42+...+1/90+1/110
S=1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
Tính
1. A= 1/2+1/6+1/12+/1/20+1/30+1/42+1/56
2. B = 3/2+5/6+7/12+-9/20+11/30-13/42+15/56
Tính tổng A= 1- 5/6 +7/12 - 9/20 + 11/30 - 13/42 + 15/56 - 17/72 + 19/90 - 21/110 + 23/132 - 25/156
Tính tổng:
a)A=1/20+1/30+1/42+1/56+1/72+1/90+1/110
b)B=1/2+1/4+1/6+1/8+...+1/512+1/1014
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110 nhanh lên nhé các bạn mình cần ngay bây giờ
1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72+1/90 + 1/110 + 1/132 = ?