А) (1 - 3/4) (4/5 - 3/4)= (1/4) (1/5 - 3/4)= (1/4) * (-19/20)= -19/80
в) 14 (1/2 + 1/3 + 1/4)= 14 (6/12 + 4/12 + 3/12)= 14 (13/12)= 14 13/12= 182/12= 15 1/6
А) (1 - 3/4) (4/5 - 3/4)
= (1/4) (1/5 - 3/4)
= (1/4) * (-19/20)
= -19/80
в) 14 (1/2 + 1/3 + 1/4)
= 14 (6/12 + 4/12 + 3/12)
= 14 (13/12)
= 14 13/12
= 182/12
= 15 1/6