Решите плиз спасибо заранее

(20 1/2 + 18 1/4) + 3 3/4 = 42 1/2 1) 20 1/2 + 18 1/4 = 38 1/2 + 1/4 = 38 2/4 + 1/4 = 38 3/4 2) 38 3/4 + 3 3/4 = 41 6/4 = 42 2/4 = 42 1/2

1(20 1/2 + 18 1/4)= 41/2+73/4= 155/4 2(155/4 +3 3/4)= 155/4 + 15/4=170/4 = 42,5