\(\left[\frac{1}{2}-\frac{1}{3}+\frac{1}{4}\right]:\left[\frac{1}{6}-\frac{1}{x}\right]=17,5\)
\(\Rightarrow\frac{5}{12}:\left[\frac{1}{6}-\frac{1}{x}\right]=\frac{35}{2}\)
\(\Rightarrow\frac{1}{6}-\frac{1}{x}=\frac{5}{12}:\frac{35}{2}\)
\(\Rightarrow\frac{1}{6}-\frac{1}{x}=\frac{1}{42}\)
\(\Rightarrow\frac{1}{x}=\frac{1}{6}-\frac{1}{42}\)
\(\Rightarrow\frac{1}{x}=\frac{1}{7}\)
\(\Rightarrow x=1:\frac{1}{7}\)
\(\Rightarrow x=7\)
Học tốt # ^-<
( 1/2 - 1/3 + 1/4 ) : ( 1/6 - 1/x ) = 17,5
( 6/12 - 4/12 + 3/12 ) : ( 1/6 - 1/x) = 17,5
5/12 : ( 1/6 - 1/x ) = 17,5
1/6 : 1/ x = 5/12 : 17,5
1/6 : 1/ x = 1/42
1/x = 1/6 : 1/42
1/x = 7
1 : x = 7
x = 1:7
x = 7
