Tìm x,biết rằng:
a)1/5.8+1/8.11+1/11.14+...1/x(x+3)=101/1540
b)1+1/3+1/6+1/10+...+1/x(x+1):2=1 1991/1993
*1 1991/1993 là hỗn số nha
Tìm x biết 1+1/3+1/6+1/10+...+2/x(x+1)=1/1991/1993
Giup minh voi!
Tim x:
a) 1/5.8 + 1/8.11 + 1/11.14 +........+ 1/x(x+3) = 101/1540
b) 1 + 1/3 + 1/6+ 1/10+......+ 1/x(x+1):2 = hon so 1 1991/1993
Ai nhanh nhat dung nhat tick lun!(Nho ghi cach giai ro rang)
Tìm x biết 1+1/3+1/6+1/10+...+2/x(x+1)=1/1991/1993
1 + \(\dfrac{1}{3}\) + \(\dfrac{1}{6}\) + \(\dfrac{1}{10}\) +...+ \(\dfrac{1}{x\left(x+1\right):2}\) = \(1\dfrac{1991}{1993}\)
1+1/3+1/6+1/10+.....+1/x(x+1)=1991/1993
1+1/3+1/6+1/10+.....+1/x(x+1)=1991/1993
1+1/3+1/6+11/10+.......+1/x(x+1):2=1va 1991/1993
Tính nhanh
1/3 + 1/6 + 1/10 +....+ 1/x(x + 1) = 1 + 1991/1993