Question

ПОМОГИТЕ ОЧЕНЬ СРОЧНО ​

Answer 1

1)

$48 \times ( - 3) = - 144$

$- 18 \div ( - 4) = 4.5$

$- 43.8 \times ( - 0.7) = 30.66$

$- 48.72 \div 12 = - 4.06$

$- 4 \frac{2}{7} \times 1 \frac{2}{5} = - \frac{30 \times 7}{7 \times 5} = - 6$

$24 \div ( - \frac{8}{11} ) = - \frac{24 \times 11}{8} = - 3 \times 11 = - 33$

2)

$8 \times ( - 125) \times ( - 0.16) = - 1000 \times ( - 0.16) = 160$

$\frac{5}{9} \times ( -3.5) \times ( - 1 \frac{4}{5} )\times 0.8 = \frac{5 \times 7 \times 9 \times 4}{9 \times 2 \times 5 \times 5} = \frac{1 \times 7 \times 1 \times 2}{1 \times 1 \times 1 \times 5} = \frac{14}{5} = 2 \frac{4}{5} = 2.8$

3)

$- 2(a - 3) + 4(a + 1) = - 2a + 6 + 4a + 4 = 2a + 10$

4)

$- 25a \times 0.4b = - 10ab = - 10 \times 1 \frac{1}{15} \times ( - 2 \frac{1}{2} ) = \frac{10 \times 16 \times 5}{15 \times 2} = \frac{5 \times 16 \times 1}{3 \times 1} = \frac{80}{3} = 26 \frac{2}{3}$

5)

$( - 1.14 - 0.96) \div ( - 4.2) + 1.8 \times ( - 0.3) = - 2.1 \div ( - 4.2) - 0.54 = 0.5 - 0.54 = - 0.04$

6)

$- 3(1.2x - 2) - (4 - 4.6x) + 6(0.2x - 1) = - 3.6x + 6 - 4 + 4.6x + 1.2x - 6 = 2.2x - 4 = 2.2 \times \frac{15}{22} - 4 = \frac{22 \times 15}{10 \times 22} - 4 = \frac{3}{2} - 4 = 1.5 - 4 = - 2.5$

7)

$0.9x -( 0.7x + 0.6y) = 0.9x - 0.7x - 0.6y = 0.2x - 0.6y = - 0.2(3y - x) = - 0.2 \times 9 = - 1.8$