Составьте числовое выражение:
1) частное от деления суммы чисел 4/9 и -5/6 на число -14/27
2) разность произведения чисел -1,5 и 4 и числа 2
3)произведение суммы и разности чисел -1,9 и 0,9
4) куб разности чисел 6 и 8

В решении.

Объяснение:

7) (а⁻⁴)⁸ = а⁻³²;

8) (а³)⁻⁷ * (а⁻⁴)⁻⁵ : (а⁻⁵)⁸ =

= а⁻²¹ * а²⁰ : а⁻⁴⁰ =

= а⁻¹ : а⁻⁴⁰ = 1/а : 1/а⁴⁰ = (1*а⁴⁰)/(а*1) = а³⁹;

9) (а⁵b⁻³c⁴)⁻¹⁰ =

= a⁻⁵⁰b³⁰c⁻⁴⁰ = b³⁰/a⁵⁰c⁴⁰;

10) (a²b⁻³)⁻³ * (a⁻⁴b⁻⁹)⁶ =

= a⁻⁶b⁹ * a⁻²⁴b⁻⁵⁴ =

= b⁹/a⁶ * 1/a²⁴b⁵⁴ =

=(b⁹ * 1)/(a⁶*a²⁴b⁵⁴) =

= 1/a⁶⁺²⁴b⁵⁴⁻⁹ =

= 1/a³⁰b⁴⁵;

11) ((a¹²b⁻⁴)/(c⁵d⁻¹³))⁻² =

=(a⁻²⁴b⁸)/(c⁻¹⁰d²⁶) =

=b⁸/a²⁴ : d²⁶/c¹⁰ =

= (b⁸c¹⁰)/(a²⁴d²⁶);

12) (a⁷/b⁻³)⁻⁴ * (a⁻³/b⁹)⁻¹² =

= (a⁻²⁸/b¹²) * (a³⁶/b⁻¹⁰⁸) =

= (1/a²⁸ : b¹²) * (a³⁶ : 1/b¹⁰⁸) =

= 1/(a²⁸b¹²) * (a³⁶b¹⁰⁸) =

= (a³⁶b¹⁰⁸)/(a²⁸b¹²) =

= a⁸b⁹⁶.

Вычислить значение выражения:

4) 3⁻¹⁴ * 3⁻¹⁹ : 3⁻³⁴ =

= 3⁻³³ : 3⁻³⁴ =

= 1/3³³ : 1/3³⁴ =

=3³⁴/3³³ = 3;

5) (13⁻⁹)⁴ * (13⁻²)⁻¹⁸ =

= 13⁻³⁶ * 13³⁶ =

= 13³⁶/13³⁶ = 1;

6) (2⁻⁴ * (2⁻³)⁵)/((2⁻⁸)² * 2⁻³) =  

= (2⁻⁴ * 2⁻¹⁵)/(2⁻¹⁶ * 2⁻³) =  

=2⁻¹⁹/2⁻¹⁹ = 1.

1) x² - 2x - 48 = 0;

D = b² - 4ac;

D = (-2)²- 4 • 1 • (-48) = 4 + 192 = 196; √D = 14;

x = (-b ± √D)/(2a);

x1 = (2 + 14)/2 = 16/2 = 8;

x2 = (2 - 14)/2 = - 12/2 = -6;

x² - 2x - 48 (x - 8)(x + 6).

2) 2x²- 5x + 3 = 0;

D = (-5)² - 4 • 2 • 3 = 25 + 24 = 49; √D = 7;

x1 = (5 + 7)/4 = 12/4 = 3;

x2 = (5 - 7)/4 = -2/4 = -0,5;

2x² - 5x + 3 = 2(x + 0,5)(x - 3) = (2x + 1)(x - 3).

3) 3x² - 10x + 3 = 0;

D = (-10)² - 4 • 3 • 3 = 100 - 36 = 64; √D = 8;

x1 = (10 + 8)/6 = 18/6 = 3;

x2 = (10 - 8)/6 = 2/6 = 1/3;

3x² - 10x + 3 = 3(x - 1/3)(x - 3) = (3x - 1)(x - 3).

4) 5x² - x - 42 = 0;

D = (-1)^2 - 4 • 5 • (-42) = 1 + 840 = 841; √D = 29;

x1 = (1 + 29)/10 = 30/10 = 3;

x2 = (1 - 29)/10 = -28/10 = -2,8;

5x² - x - 42 = 5(x + 2,8)(x - 3) = (5x +14)(x - 3).

5) 3x² - 8x + 5 = 0;

D = (-8)^2 - 4 • 3 • 5 = 64 - 60 = 4; √D = 2;

x1 = (8 + 2)/6 = 10/6 = 5/3;

x2 = (8 - 2)/6 = 6/6 = 1;

3x² -8x + 5 = 3(x - 5/3)(x - 1) = (3x - 5)(x - 1).

6) 36x² - 12x + 1 = 0;

D = (-12)^2 - 4 • 36 • 1 = 144 - 144 = 0;

x1 = x2 = 12/72 = 1/6;

36x²- 12x + 1 = 36(x - 1/6)(x - 1/6) = 6(x - 1/6) * 6(x - 1/6) = (6x - 1)(6x - 1).