\(1,2\cdot\dfrac{17}{23}+1\dfrac{1}{5}\cdot\dfrac{6}{23}\)
\(=1,2.\dfrac{17}{23}+\dfrac{6}{5}\cdot\dfrac{6}{23}\)
\(=1,2\cdot\dfrac{17}{23}+1,2\cdot\dfrac{6}{23}\)
\(=1,2.\left(\dfrac{17}{23}+\dfrac{6}{23}\right)\)
\(=1,2\cdot\dfrac{23}{23}\)
\(=1,2.1\)
\(=1,2\)
\(1,2\times\dfrac{17}{23}+1\dfrac{1}{5}\times\dfrac{6}{23}\\ =1,2\times\dfrac{17}{23}+1,2\times\dfrac{6}{23}\\ =1,2\times\left(\dfrac{17}{23}+\dfrac{6}{23}\right)\\ =1,2\times1\\ =1,2\)