Question

Допоможіть!!!!!
Алгебра 8 клас ​

Answer 1

Объяснение:

1)

$- 20 \times \frac{1}{ {4}^{3} } = - 5 \times \frac{1}{16} = - \frac{5}{16}$

2)

$\frac{1}{ {3}^{2} } - \frac{1}{12} = \frac{1}{9} - \frac{1}{12} = \frac{1}{36}$

3)

$(2.8 \times {10}^{ - 4} ) \times ( {10}^{ - 4} \times {10}^{ - 2} ) = 18.2 \times {10}^{ - 4 - 2} = 18.2 \times {10}^{ - 6} = 1.82 \times {10}^{ - 5}$

4)

$(4.7 + 2.1) \times {10}^{6} = 6.8 \times {10}^{6}$