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Tìm sốtựnhiên x biết: \(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+....+\dfrac{1}{x.\left(x+2\right)}=\dfrac{20}{41}\)
Tìm x biết
1/1.3 + 1/3.5 + 1/5.7 +....+ 1/x(x+1) = 20/41
Tìm x
\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{x.\left(x+2\right)}=\frac{20}{41}\)
Tìm x, biết:
\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{x.\left(x+2\right)}=\frac{20}{41}\)
tim x
1/(1.3)+1/(3.5)+1/(5.7)+..........+1/(x.(x+2)=1005/2011
luu y:/ la phan;.la nhan
1/1.3+1/3.5+1/5.7+....+1/n(n+2)=20/41
1/3.5+1/5.7+...+1/x.(x+2)=20/41 tìm x hộ mình với
\(\frac{x}{1.3}+\frac{x}{3.5}+\frac{x}{5.7}+...+\frac{x}{39.41}=\frac{1}{41}\)
\(\frac{1}{1.3}\)\(+\frac{1}{3.5}\)\(+\frac{1}{5.7}\)\(+...+\)\(\frac{1}{x.\left(x+2\right)}\)\(=\frac{20}{41}\)