Очень срочно пожалуйста

3.

$1) \: \: \: 20 {a}^{3} \times (5a) ^{2} = 20 {a}^{3} \times 25 {a}^{2} = 500 {a}^{5} \\ 2) \: \: \: - 0.4 {x}^{5} \times (2 {x}^{3} ) ^{4} = - 0.4 {x}^{5} \times16 {x}^{12} = - 6.4 {x}^{17} \\ 3) \: \: \: {( - {c}^{3} )}^{2} \times 12 {c}^{6} = {c}^{6} \times 12 {c}^{6} =12 {c}^{12} \\ 4) \: \: \: {(3 {x}^{6} {y}^{3}) }^{4} \times ( - \frac{1}{81} x {y}^{2} ) = 81 {x}^{24} {y}^{12} \times ( - \frac{1}{81} x {y}^{2} ) = - {x}^{25} {y}^{14} \\ 5) \: \: \: ( - \frac{2}{3} a {b}^{5} ) ^{3} \times 18 {a}^{5} b = - \frac{8}{27} {a}^{3} {b}^{15} \times 18 {a}^{5} b = - \frac{8 \times 18}{27} {a}^{8} {b}^{16} = - \frac{16}{3} {a}^{8} {b}^{16} = - 5 \frac{1}{3} {a}^{8} {b}^{16} \:$

4.

$1) \: \: \: (4a {c}^{2} ) ^{3} \times (0.5 {a}^{3} c) ^{2} = 64 {a}^{3} {c}^{6} \times 0.25 {a}^{6} {c}^{2} = 16 {a}^{9} {c}^{8}$
$2) \: \: \: ( \frac{2}{3} {x}^{2} {y}^{3} ) ^{3} = \frac{8}{27} {x}^{6} {y}^{9}$
$3) \: \: \: - ( - {x}^{2} {y}^{4} ) ^{4} \times (6 {x}^{4} y) ^{2} = - {x}^{8} {y}^{16} \times 36 {x}^{8} {y}^{2} = - 36 {x}^{16} {y}^{18}$
$4) \: \: \: ( - 10 {a}^{3} {b}^{2} ) ^{5} \times ( - 0.2a {b}^{2} ) ^{5} = - 100000 {a}^{15} {b}^{10} \times ( - 0.0008 {a}^{5} {b}^{10} ) = 80 {a}^{20} {b}^{20}$

5. решение на фото