Question

49-calcule o valor das expressoes A)3/5-1-2/5 B)4-1/10 +2/5 C)1/2-(-3/5)+7/10 D)-2-(-1/2)-1/8 E)5/12+(-1/4)-(+1/6) Pagina 72

Answer 1

a)

$\frac{3}{5} - 1 \frac{ - 2}{5} = \frac{3}{5} - \frac{5}{5} - \frac{ 2}{5} = \frac{3 - 7}{5} = \frac{ - 4}{5}$

b)

$4 - \frac{1}{10} + \frac{2}{5} = \frac{40}{10} - \frac{1}{10} + \frac{4}{10} = \frac{43}{10}$

c)

$\frac{1}{2} - ( - \frac{3}{5} ) + \frac{7}{10} = \frac{5}{10 } + \frac{6}{10} + \frac{7}{10} = \frac{18}{10} = \frac{9}{5}$

d)

$- 2 - ( - \frac{1}{2} ) - \frac{1}{8 } = \frac{16}{8} + \frac{4}{8} - \frac{1}{8} = \frac{19}{8}$

e)

$\frac{5}{12} - \frac{1}{4} - \frac{1}{6} = \frac{5}{12} - \frac{3}{12} - \frac{2}{12 } = \frac{0}{12} = 0$