Question

Помогите решить карточку пожалуйста

Answer 1

1.
а)
${k}^{6}$
б)
${k}^{45}$
в)
${( - 3 {k}^{4}n) }^{3} \times \frac{1}{9} {k}^{3} {n}^{5} = - 27 {k}^{12} {n}^{3} \times \frac{1}{9} {k}^{3} {n}^{5} = - 3 {k}^{15} {n}^{8}$
2.
а)
$\frac{7}{9} - \frac{7}{12} = \frac{28}{36} - \frac{21}{36} = \frac{7}{36}$
б)
$15 \times 5 \times \frac{4}{5} = 15 \times \frac{29}{5} = 87$
в)
$( \frac{3}{4} + 3.15) \div \frac{13}{16} = (0.75 + 3.15) \div \frac{13}{16} = 3 \times \frac{9}{10} \div \frac{13}{16} = \frac{39 \times 16}{10 \times 13} = 4.8$
3.
2(5-3х)+8=4+15х
10-6х+8-4-15х=0
14=21х
$x = \frac{14}{21} = \frac{2}{3}$
4.
$\frac{ - 2.4 - 3}{2.4 \times 3} = \frac{ - 5.4}{7.2} = - 0.75$
5. решение на фото