Tìm số tự nhiên x biết : \(\frac{1}{5.8}+\frac{1}{8.11}+...+\frac{1}{x.\left(x+3\right)}=\frac{1}{18}\)
Tìm x biết:
1/5.8+1/8.11+1/11.14+......+1/x(x+3)=98/1545
tìm x biết 1/5.8+1/8.11+1/11.14+..............+1/x[x+3]=101/1540
Tìm x , biết : \(\frac{1}{5.8}+\frac{1}{8.11}+\frac{1}{11.14}+...+\frac{1}{x.(x+3)}=\frac{101}{1504} \)
Tìm x 1/5.8+1/8.11+1/11.14+...+1/x.(x+3)=98/1545
Tìm x biết:
3.x/2.5+3.x/5.8+3.x/8.11+3.x/11.14=1/21
tìm x biết
1/5.8+1/8.11+1/11.14+...+1/x(x+3)=101/15401+1/3+1/6+1/10+...+1/x(x+1):2=1 1991/1993tính x biết: 1/5.8 + 1/8.11+1/11.14+ ....... +1/x(x+3)= 1 1991/1993
1/5.8 + 1/8.11 + 1/11.14 + ........+1/x.[x+3] = 101/1540
