HELP!! Срочно! Срочно! Срочно! Срочно!

1)

${3}^{ - 3} \times {3}^{5} = {3}^{ - 3 + 5} = {3}^{2} \\ {5}^{ - 2} \div {5}^{ - 3} = {5}^{ - 2 - ( - 3)} = {5}^{1} = 5 \\ 2) \frac{ {a}^{5} \times {a}^{ - 2} }{ {a}^{ - 3} } = \frac{ {a}^{3} }{ {a}^{ - 3} } = {a}^{3 - ( - 3)} = {a}^{6 } \\ ({ {x}^{ - 2} })^{ - 3} \times {x}^{4} = {x}^{6} \times {x}^{4} = {x}^{10 } \\$
3) (6^-3*2^-4):18^-2=18^2:(6^3*2^4)=324:(216*16)=36:(24*16)=6:(4*16)=3:32