Пошаговое объяснение:
1) 2 * (-4) = -8
2) 1,5 - 2 2/3 = 1 5/10 - 2
2/3 = 1 15/30 - 2 20/30 = -1 5/30 = -1 1/6
3) -1 1/6 * (-4/15) * 9/80 =
-7/6 * (-4/15) * 9/80 =
-7/6 * ( -1/5 * 3/20) =
-7/6 * (-3/100) = 21/600 = 7/200
4) -8 + 7/200 = -7 200/200 + 7/200 = -7 193/200
