Обчислити 1 1/8(-80)-1 1/10: (-80) -4,5•1 1/5+7(-1,8)

7999
примерно 0,740648
10800

1 1/8*(-80) - 1 1/10:(-80)
  =  3999ц. 7/800,
-4,5*1 1/5 + 7*(-1,8)

1) 1 1/8 * (-80) = -9/8 * 80 = -9 * 10 = -90,
2) 1 1/10 : (-80) = -11/10 * 1/80 = -11/800,
3) -90 - (-11/800) = -90 + 11/800 = -89 789/800,
4) -4,5 * 1 1/5 = -45/10 * 6/5 = -54/10 = -5,4,
5) 7 * (-1,8) = -12,6,
6) -5,4 + (-12,6) = -5,4 - 12,6 = -18,
7) -89 789/800 : (-18) = 89 789/800 * 1/18 = 3999ц. 7/800