\(\frac{1}{3}\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{x}-\frac{1}{x+3}\right)=\frac{6}{19}\)
\(\frac{1}{3}\left(1-\frac{1}{x+3}\right)=\frac{6}{19}\)
\(\frac{1}{3}\times\frac{x+3-1}{x+3}=\frac{6}{19}\)
\(\frac{x+3-1}{x+3}=\frac{6}{19}\div\frac{1}{3}\)
\(\frac{x+2}{x+3}=\frac{18}{19}\)
x = 16
tìm x
1/1.4+1/4.7+1/7.10+....+1/x.(x+3)=6/19
Tìm x
\(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{x.\left(x+3\right)}=\frac{6}{19}\)
Tìm x biết
\(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{x.\left(x+3\right)}=\frac{6}{19}\)
Tìm X :\(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{X.\left(X+3\right)}=\frac{6}{19}\)
giúp nhé các bạn !
1/1.4+1/1.4+1/7.10+...+1/x.(x+3)=6/19
Tìm x:
1/1.4 + 1/4.7 + 1/7.10 + ... + 1/x.(x+3)= 667/2002
Tìm x
1/ 1.4+ 1/ 4.7+ 1/ 7.10+....+1/ x.( x+ 3)= 672/ 2017
Tìm x biết : (1/1.4+1/4.7+1/7.10+....+1/97.100) = 0,33.x/2009
1/1.4 + 1/4.7 + 1/7.10 + ... + 1/97.100=0,33.x/2009