5) 500 - (28.5+25.4-120: 2); 6-(28:14 + 420

Решение:

\( 120 : 2 = 60 \)

\( 28.5 + 25.4 - 60 = 53.9 - 60 = -6.1 \)

\( 500 - (-6.1) = 500 + 6.1 = 506.1 \)

\( 28 : 14 = 2 \)

\( 2 + 420 = 422 \)

\( 6 - 422 = -416 \)

Ответ: 506.1; -416