Các câu hỏi tương tự
A= 1/3 + 1/6 + 1/10 + 1/15 + 1/21 +1/28 + 1/36 +1/45 + 1/55
TÍNH 1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66
tính thuận tiện
1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+1/78
B=\(\dfrac{1}{6}\)+\(\dfrac{1}{15}\)+\(\dfrac{1}{21}\)+\(\dfrac{1}{28}\)+\(\dfrac{1}{36}\)+\(\dfrac{1}{45}\)+\(\dfrac{1}{55}\)+\(\dfrac{1}{66}\)
A=1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
Tính nhanh giá trị biểu thức: M = 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
Tính nhanh giá trị biểu thức: M = 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
Tim X
a,X - 20/11 x 13 - 20/13 x 15 - 20/15 x 17 -...-20/53 x 55 = 3/11
b,1/21 + 1/28 +1/36 + ... +2/Xx(x + 1) = 2/9