Question

4. Qual é o valor de cada expressão?

a) $1,7 + ( \frac{2}{3} - 0,25 ) - \frac{1}{4}$

b) $[ 1,6 + ( \frac{1}{4} - 0,75 + 2 ) - \frac{3}{5}$

Answer 1

a)
1,7+($\frac{2}{3}$-0,25)-$\frac{1}{4}$
$\frac{17}{10}$+( $\frac{2}{3}$-$\frac{1}{4}$)-$\frac{1}{4}$
$\frac{17}{10}$+$\frac{5}{12}$-$\frac{1}{4}$
$\frac{102+25-15}{60}$
$\frac{112}{60}$
$\frac{28}{15}$

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b)
[1,6+($\frac{1}{4}$-0,75+2)-$\frac{3}{5}$]
[$\frac{16}{10}$+($\frac{1}{4}$-$\frac{3}{4}$+2)-$\frac{3}{5}$]
[$\frac{8}{5}$+($\frac{1-3+8}{4}$)-$\frac{3}{5}$]
[$\frac{8}{5}$+$\frac{6}{4}$-$\frac{3}{5}$]
[$\frac{8}{5}$+$\frac{3}{2}$-$\frac{3}{5}$]
[$\frac{16+15-6}{10}$]
[$\frac{25}{10}$]