(m - 3)(m + 3)(m² + 9 ) + (m + 1)(2m² - 3) - (3- m²)² =
= (m² - 3²)(m² + 3²) + 2m³ - 3m + 2m² - 3 - (3² - 2*3*m² + (m²)² ) =
= (m²)² - (3²)² + 2m³ + 2m² - 3m - 3 - (9 - 6m² + m⁴) =
= m⁴ - 81 + 2m³ + 2m² - 3m - 3 - 9 + 6m² - m⁴ =
= (m⁴ - m⁴) + 2m³ + (2m² + 6m²) - 3m - (81+3+9) =
= 2m³ + 8m² - 3m - 93
m = - 3
2 * (-3)³ + 8*(-3)² - 3*(-3) - 93 = 2 * (-27) + 8*9 + 9 - 93 =
= - 54 + 72 + 9 - 93 = - (54 + 93) + (72+9) = - 147 + 81 = - 66
(4x + 1)(3x - 2) = (6x + 1)(2x + 3) - 4x
12х² - 8х + 3х - 2 = 12х² + 18х + 2х + 3 - 4х
12х² - 5х - 2 = 12х² + 16х + 3
12х² - 5х - 12х² - 16х = 3 + 2
- 21х = 5
х = - ⁵/₂₁
I число = n
II число = (n + 1)
III число = (n + 1 + 1) = (n + 2)
IV число =(n + 2 + 1) = (n + 3)
(n + 1)(n + 3) - n(n + 2) = 17
n² + 3n + n + 3 - n² - 2n = 17
2n + 3 = 17
2n = 17 - 3
2n = 14
n = 7
7 + 1 = 8
7 + 2 = 9
7 + 3 = 10
Ответ : 7, 8, 9, 10 .
32-4(х+7)=6х-12
32-4х-28=6х-12
32-28+12=6х+4х
16=10х
<u>х=1,6</u>
Проверка:
32-4(1,6+7)=6·1,6-12
-2,4=-2,4
-9.1m-1,4m= -10,5m
49b-43x+x+2x=49b-40x