Question

Determine o valor de cada expressão sabendo que a=5/4, b=4/5 e c= 0,5
A)a+b+c=
B) 2a+c -b
C) 2b-(a+c)=

Answer 1

0,5 = 1/2

a) $\frac{5}{4} + \frac{4}{5} + \frac{1}{2\\}$

$\frac{25 + 16 }{20} + \frac{1}{2}$

$\frac{41}{20} + \frac{1}{2}$

$\frac{41+10}{20} = \frac{51}{20}$

b) $2\frac{5}{4} + \frac{1}{2} -\frac{4}{5}$

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

$\frac{50 +10-16}{20}$

$\frac{44}{20}$ simplificando... = $\frac{11}{5}$

c) $2\frac{4}{5} - (\frac{5}{4}+\frac{1}{2})$

$\\\frac{8}{5} - (\frac{5}{4} + \frac{1}{2} )$

$\frac{8}{5} - (\frac{10+4}{8})$

$\frac{64-70}{40}$

$\frac{-6}{40}$ simplificando...

$\frac{-3}{20}$