Question

please answer me fast​

Answer 1

Answer:

I). -15/2

ii). 125.

Step-by-step explanation:

$i) \: \: \: \: \: \: {( {5}^{ - 1} - {3}^{ - 1} )}^{ - 1} \\ \\ = {( \frac{1}{5} - \frac{1}{3} )}^{ - 1} \\ \\ = { ( \frac{3 - 5}{15} )}^{ - 1} \\ \\ = \frac{15}{ - 2} \\ \\ = - \frac{15}{2} \\ \\ \\ \\ ii) \: \: \: \: \: \: ( {( {5}^{2} )}^{3} \times {5}^{4} ) \div {5}^{7} \\ \\ = {5}^{6 + 4} \div {5}^{7} \\ \\ = {5}^{10} \div {5}^{7} \\ \\ = {5}^{3} \\ \\ = 125.$