=\(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{4.5}+...+\dfrac{1}{11.12}\)
=\(1-\dfrac{1}{12}\)
=\(\dfrac{11}{12}\)
Đúng 0
Bình luận (0)
Các câu hỏi tương tự
A=1/2+1/6+1/12+1/20+...+1/121 tìm A theo cách thuận tiện nhất
Bài 3 tính nhanh a,5/6-1/2-1/4-1/8-1/16 b,1/3+1/6+1/12+1/24+1/48+1/96 c,1/1x2+1/2x3+1/3x4+1/4x5+1/5x6 d,1/2+1/6+1/121/20+1/30+1/42 khẩn cấp aaaaa..... huhuhu.....
27 tháng 2 2023 lúc 19:08
3. Tính bằng cách hợp lý: A) 4/9 + 2/5 + 5/9. B) 6/13 + 5/8 + 7/13. C) 5/11 + 6/25 + 66/121. D) 1/2 + 1/3 + 1/4 + 1/6 + 1/12 + 1/24.
tinh bang cach thuan tien nhat
1/2+1/6+1/12+1/20
1/2+1/6+1/12+1/20+.........+19900
1/2+1/3+1/4+1/8+1/16
1/2+1/3+1/4+1/8+1/16+.......+1/512
Tính nhanh :
1/2 + 2/4 + 3/6 + 4/8 + 5/10 + 6/12 =
1/3 + 1/4 + 1/5 + 8/10 + 20/15 + 20/30 =
A=1/2+1/6+1/12+1/20+1/30......1/9900
1/2+1/6+1/12+1/20=?
(1/2+1/6+1/12+...+1/72+1/90) : x = 9/20
1/2+ 1/6+ 1/12 +1/20+...+1/9702 +1/9900