Question

ПОМОГИТЕ ПОЖАЛУЙСТА ЗАРАНЕЕ СПАСИБО.
1) (-1/2)×(-2,125)×(-4/5)+9,35
2) -5 2/5×3,125×(-2/5)-32
3) 1,28×(-2 1/4)×3,5-45,92
4) (-6 3/4)×(-10)×(-1,3)+100

Answer 1

Ответ:

Пошаговое объяснение:

1)

(-1/2)×(-2,125)×(-4/5)+9,35 =

= (-1/2) × (-2целых 1/8) × (-4/5) + 9целых 7/20 =

= (-1/2) × (-17/8) × (-4/5) + 187/20 =

= 17/16 × (-4/5) + 187/20 = 17/4 × (-1/5) + 187/20 =

= (-17/20) + 187/20 = 170/20 = 17/2 = 8целых 1/2 или 8,5

2)

(- 5целых 2/5) × 3,125 × (-2/5) - 32 =

= (-27/5) × 25/8 × (-2/5) - 32 =

= (-27/1) × 5/8 × (-2/5) - 32 =

= (-135/8) × (-2/5) - 32 =

= (-27/4) × (-1) - 32 = 27/4 - 32 = 6целых 3/4 - 31целая 4/4 =

= - 25целых 1/4

3)

1,28 × (-2целых 1/4) × 3,5 - 45,92 =

= 1целая 7/25 × (-2целых 1/4) × 3целых 1/2 - 45целых 23/25) =

= 32/25 × (-9/4) × 7/2 - 45целых 23/25 =

= (-72/25) × 7/2 - 45целых 23/25 =

= (-252/25) - 45целых 23/25 = (-10целых 2/25) - 45целых 23/25 =

= - 55целых 25/25 = -56

4)

(-6целых 3/4) × (-10) × (-1,3) + 100 =

= (- 27/4) × (-10) × (-1целая 3/10) + 100 =

= 135/2 × (-13/10) + 100 = 27/2 × (-13/2) + 100 =

= (-351/4) + 100 = (-87целых 3/4) + 99целых 4/4 =

= 12целых 1/4