Question

1,3и4 быстрее решите

Answer 1

Вариант А1
Номер 1
$a) - 1.5 \times ( - 6) = 9 \\ b) - 1 \frac{1}{3} \times 0.75 = - \frac{4 \times 75}{3 \times 100} = - 1 \\ c) - 2.16 \div 0.36 = - 6$
$d) - 3 \frac{1}{7} \div ( - \frac{11}{14} )= \frac{22 \times 14} {7 \times 11} = 4$
Номер 3
$a)- 0.3x + 0.9 = - 4.2 \\ - 0.3x = - 4.2 - 0.9 \\ - 0.3x = - 5.1 \\ x = 17$
$b)(2 - x)(x + 3) = 0 \\ 2 - x = 0 \\ x = 2 \\ x + 3 = 0 \\ x = - 3$
Номер 4
$a) - 0.28 \times \frac{4}{7} + \frac{5}{7} \div 2 \frac{6}{7} = - \frac{28 \times 4}{100 \times 7} + \frac{5 \times 7}{7 \times 20 } = - \frac{4}{25} + \frac{1}{4} = 0.16 + 0.25 = 0.41$

$b)( - \frac{2}{3} ) ^{2} \times 2 \frac{1}{4} \times ( - 3) = \frac{4}{9} \times \frac{9}{4} \times ( - 3) = - 3$

Answer 2

Цветной пунктир-граница.