[latex]\a) \ \(-2)^2-4 dfrac{5}{16} :(-4^2)=4-dfrac{69}{16}:(-16)=4+ dfrac{69}{16cdot16} =4 dfrac{69}{256} \ \b) \ \15^{-10}:( dfrac{1}{30} )^{10}= ( dfrac{1}{15} )^{10}cdot30^{10}= ( dfrac{1}{15} cdot30)^{10}=2^{10}=1024[/latex]

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