Question

 (4 -12/10 ) ː 2 + 30%

Answer 1

\(\left(4-\dfrac{12}{10}\right):2+30\%=\left(4-\dfrac{6}{5}\right):2+30\%=\dfrac{14}{5}:2+\dfrac{3}{10}=\dfrac{7}{5}+\dfrac{3}{10}=\dfrac{14}{10}+\dfrac{3}{10}=\dfrac{17}{10}\)

Answer 2

 (4 -12/10 ) ː 2 + 30% = 14/5 : 2 + 3/10 = 7/5 + 3/10 = 17/10