Question

Помогите ,Дам сорок балов

Answer 1

Ответ:

1)

$\frac{31}{16}$

2)

$- 18$

Объяснение:

1) Якщо x=1/4

$64x {}^{3} - x {}^{2} + 1 = \\ = 64 \times ( \frac{1}{4} ) {}^{3} - ( \frac{1}{4} ) {}^{2} + 1 = \\ = 64 \times \frac{1}{64} - \frac{1}{16} + 1 = \\ = 2 - \frac{1}{16} = \\ = \frac{2 \times 16 - 1}{1 \times 16} = \\ = \frac{32 - 1}{16} = \frac{31}{16}$

2) Якщо m=4 n=-3

$4mn - 3m + 2n - \\ - 4mn = \\ = - 3m + 2n = \\ = - 3 \times 4 + 2 \times ( - 3) = \\ = - 12 - 6 = \\ = - 18$