calcule as expressões a seguir:
a) 0,5^-2-{0,2^-3-0,1^-2*[0,25^-1/2-(1/9)^1/2]}
b) [raiz quadrada de 0,25+4(0,5)^4+(8)^-2/3]+2^0
c) 3/raiz quadrada de (24/9/7/2-2)^-1
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