Question

Calculati : 1,2 - 4,(3) =

Answer 1

$\displaystyle 1,2-4,(3)= \frac{12}{10} - \frac{43-4}{9} = \frac{12}{10} - \frac{39}{9} = \frac{108}{90} - \frac{390}{90} =- \frac{282}{90} =\boxed{- \frac{141}{45} }$