Question

Зробіть будь ласка!!

Answer 1

1)

$9 \times ( - 7) = - 63$

$( - 0.8) \times ( - 1.2) = 0.96$

$- 3.6 \times \frac{4}{9} = - \frac{36 \times 4}{10 \times 9} = - \frac{4 \times 2}{5} = - \frac{8}{5} = - 1 \frac{3}{5} = - 1.6$

2)

$- 6(3a - 4) = - 6 \times 3a - 6 \times ( - 4) = \\ - 18a + 24$

3)

$11y - 6 - 5y + 10 = (11 - 5)y + 4 = \\ 6y + 4$

4)

$- 4( - 2 \frac{1}{2} a) = \frac{4 \times 5}{2} a = 2 \times 5a = 10a$

$- 6(8a - 2) - 3.6(a + 4) = \\ - 48a + 12 - 3.6a - 14.4 = \\ - 44.4a - 2.4$

$- 0.8x \times 1 \frac{1}{4} \times ( - 4) = \frac{4 \times 5 \times 4}{5 \times 4} x = 4x$

$- 2.1(3.5x - 0.2) + 1.2(0.3 - 0.4x) = \\ - 7.35x + 0.42 + 0.36 - 0.48x = \\ - 7.83x + 0.78$

5)

$6 \frac{1}{4} \times ( - 8) - 4 \div ( - 1 \frac{1}{3} ) {}^{2} \times \frac{4}{5} - ( - 2.4 \times 4 \frac{7}{12} ) = - 40.8 \\ 6 \frac{1}{4} \times ( - 8) = - \frac{25 \times 8}{4} = - 25 \times 2 = - 50 \\ ( - 1 \frac{1}{3} ) {}^{2} = ( \frac{4}{3} ) {}^{2} = \frac{16}{9} \\ - 4 \div \frac{16}{9} = - \frac{4 \times 9}{16} = - \frac{9}{4} \\ - \frac{9}{4} \times \frac{4}{5} = - \frac{9 \times 4}{4 \times 5} = - \frac{9}{5} = - 1 \frac{4}{5} = - 1.8 \\ - 2.4 \times 4 \frac{7}{12} = - \frac{12 \times 55}{5 \times 12} = - 11 \\ - 50 - 1.8 - ( - 11) = - 51.8 + 11 = - 40.8$