Question

[(três quartos) elevado a -2 - um terço - 0,6] elevado a 2?

Answer 1

$(\frac{3}{4}) {}^{ - 2} - ( \frac{1}{3})2 = \\ ( \frac{ - 3}{ - 4}) {}^{ - 2} = 0.999{}^{2} = 8.1000 > 8 \\ ( \frac{1}{3}) {}^{2} = 0.6 {}^{2} = 3.6 > 4 \\ 8 - 4 = 4$
Entao a resposta e "4".

Answer 2

$(( \frac{3}{4})^{ - 2} - \frac{1}{3} - 0.6)^{2} = ( \frac{16}{9} - \frac{1}{3} - 0.6)^{2} = (\frac{16}{9} - \frac{3}{9} - 0.6)^{2} = ( \frac{13}{9} - \frac{5.4}{9} ) ^{2} = ( \frac{7.6}{9} )^{2} = \frac{57.76}{81} = \frac{5776}{8100}$