a: 0,2<x<0,26
=>x=0,21; x=0,22; x=0,23; x=0,24; x=0,25
b: \(x\frac13\times2\frac{1}{12}=6\frac{1}{12}\)
=>\(\left(x+\frac13\right)\times\frac{25}{12}=\frac{73}{12}\)
=>\(x+\frac13=\frac{73}{12}:\frac{25}{12}=\frac{73}{25}\)
=>\(x=\frac{73}{25}-\frac13=\frac{219-25}{75}=\frac{194}{75}\)


