Question

1) calcule mentalmente, as raízes:
a) √144=
b) √0,16=
c) ³√-64=
d) ³√⅛=​

Answer 1

a)

$\sqrt{144} = 12 \: pois \: 12 \times 12 = 144$

b)

$\sqrt{0.16} = 0.4 \: pois \: 0.4 \times 0.4 = 0.16$

c)

$\sqrt[3]{ - 64} = - 4 \: pois \: - 4 \times - 4 \times - 4 = - 64$

d) ³√(1/8) = ³√(1/2)³ = (1/2)