Упростите выражения и найдите их значения 9.3

1)
${ ({n}^{5}) }^{2} \div {( {n}^{3}) }^{3} \times {n}^{10} \div {n}^{8} = {n}^{5 \times 2 - 3 \times 3 + 10 - 8} = {n}^{3} = { - 0.3}^{3} = - 0.027$
2)
${a}^{20 + 8 \times 4 - 10 \times 5} = {a}^{20 + 32 - 50} = {a}^{2} = {5.5}^{2} = 30.25$
3)
${b}^{17 \times 3 - 40 - 4 \times 2} = {b}^{51 - 40 - 8} = {b}^{3} = {( - \frac{2}{7} )}^{3} = - \frac{8}{343}$
4)
${a}^{(4 \times 4 + 31) - (20 \times 2 + 3)} = {a}^{(16 + 31) - (40 + 3)} = {a}^{47 - 43} = {a}^{4} = {4}^{4} = 16 \times 16 = 256$