Ответ:
Пошаговое объяснение:
1.
((-1.2)² × 1.5 - 13) : (-0.4)= 27.1
1.2² × 1.5 - 13 = (12/10)² × 1.5 - 13 = (6/5)² × 1.5 - 13
36/25 × 1.5 - 13 = 1.44 × 1.5 - 13 = 2.16 - 13 = -10.84
(-10.84) : (- 0.4) = 10.84 : 0.4 = 27.1
2.
а) 6.2(х - 3)= - 0.4(2х - 2) - 4
6.2х - 18.6 = - 0.8х + 0.8 - 4
6.2х - 18.6 = - 0.8х - 3.2
6.2х + 0.8х = - 3.2 + 18.6
7х=15.4
х=15.4/7
х=2.2
б)2(3х - 3) - 8х= -18
6х - 6 - 8х=-18
-2х - 6= - 18
-2х= - 18 + 6
-2х = - 12
х= 6
3.
-3 × (1.2 × (-3) - 5) +4 × (6.7 × (-3) - 5.1 × 5)
-3 × (-8.6) + 4 × ( -45.6) = -156.6