oblicz
a) 81 do 3/4
b) 2 do - 3/5
c) - pierwiastek z 49 + ( 1/27) do 1/3 + 8 do - 2/3
prosze jeszcze o dokładne wyjaśnienie prosze !!! i jak najszybciej
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a)81¾=(81^¼)³=3³=27
b)2^⁻⅗=(2^⅕)⁻³=(1/8^⅕)
c)-√⁴⁹ +∛27 +(∛8)⁻²=-7+∛1/27+8^⁻⅔=-7+1/3+(∛2³)⁻²=-7+⅓+(½)²=-7+⅓+¼=-7+(4+3)/12=-7+7/12=(-84+7)/12=-77/12