15. Множення раціональних чисел - 17. Ділення » 699

Обчисли. а) ((-4/15 + 7/12 - 3/10) ∶ 2/15)/((-11/16 + 19/24) ∶ (-5/12)) + (5/4 ∶ (-2 1/2))/(2/3 ∶ 4/5 - 7/8) = ((-16/60 + 35/60 - 18/10) • 15/2)/((-33/48 + 38/48) • (-12/5)) + (4/5 • (-5/2))/(2/3 • 5/4 - 7/8) = ((1/60 ) • 15/2)/((5/48) • (-12/5)) + (-2)/(5/6 - 7/8) = (1/8)/(-1/4) + (-2)/(20/24 - 21/24) = 1/8 : (–1/4) + (–2) : (–1/24) = 1/8 • (–4) + (–2) • (–24) = 0,5 + 48 = 48,5. б) (2 1/6 ∶ (-5/36 - 1 22/27 ∶ 3 1/9))/(-5/12 • (-2 1/4 ∶ 1 11/16 + 2/15)) : (-2/3 ∶ 0,8 - 1/6)/(1 1/4 ∶ (-15/16)) = (13/6 ∶ (-5/36 - 49/27 • 9/28))/(-5/12 • (-9/4 • 16/27 + 2/15)) : (-2/3 • 5/4 - 1/6)/(5/4 • (-16/15)) = (13/6 ∶ (-5/36 - 7/12))/(-5/12 • (-4/3 + 2/15)) : (-5/6 - 1/6)/(-4/3) = (13/6 ∶ (-5/36 - 21/36))/(-5/12 • (-20/15 + 2/15)) : (-1)/(-4/3) = (13/6 • (-36/26))/(-5/12 • (-18/15)) : 3/4 = (-3)/(3/6) : 3/4 = (–3) • 6/3 • 4/3 = –8.