Question

Como se resolve esses cálculos:
a) (8-8,5)²
b) (½ + ⅓)
c) (-3 sobre 7 ao - 1 ) - ( - ½) -³
e) (2+0,5)
f) (0,5)² - (0,3)²

Answer 1

A)
$(8 - 8. 5)^{2} = (- 0. {5})^{2} =( \frac{ - 1}{2})^{2} = \frac{1}{4}$
B)
$(\frac{1}{2} + \frac{1}{3}) = \frac{3 + 2}{6} = \frac{5}{6}$
C)
$( - \frac{3}{7} - 1) - ( - \frac{1}{2} ^{ - 3}) = (- \frac{10}{7} ) - ( { - 2})^{3} = - \frac{10}{7} - ( - 8) = ( - \frac{10}{7} + 8 = \frac{46}{7}$
E)
$(2 + 0.5) = 2.5$
F)
$(0. {5})^{2} - (0. {3})^{2} = ( \frac{1} {2})^{2} - ( \frac{3} {10})^{2} = \frac{1}{4} - \frac{9}{100} = \frac{4}{25}$