Mathematics: Please help me I m practically begging u 3

Please help me I m practically begging u 3

Ответ:

shortyyashaun

12.10.2021

1 , 3 , 4

Step-by-step explanation:

${8}^{7} \: . \: {8}^{ - 12} \\ = {8}^{7 + ( - 12)} \\ = {8}^{ - 5} \\ = \frac{1}{ {8}^{5} } \\2)[tex] \frac{ {7}^{4} }{ {7}^{ - 3} } \\ = {7}^{4 - ( - 3)} \\ = {7}^{4 + 3} \\ = {7}^{7} \\3)[tex] { (\frac{1}{3} )}^{2} . \: {( \frac{1}{3} )}^{9} \\ { (\frac{1}{3}) }^{2 + 9} \\ { (\frac{1}{3} )}^{11} \\$