Question

calcule o valor das expressões numéricas

a) 5/4 • (-4/2) + 2 • (1/4) =

b) (- 0,28) • (+1,5) - (+0,7) • (-1/3) =​

Answer 1

8, 4 | 2

4, 2 I 2

2, 1 I 2

1, 1 MMC 2 × 2 × 2 = 8

a) 5/4 • (-4/2) + 2 • (1/4) =

$\frac{5}{4} . \frac{ - 4}{2} + 2. \frac{1}{4} =$

$\frac{ - 20}{8} + \frac{2}{4} =$

$\frac{ - 20 + 4}{8} =$

$\frac{ -16}{8} simplificando \: por \: 8 = - 2$

b) (- 0,28) • (+1,5) - (+0,7) • (-1/3) =

$- 0.28 \times 1.5 + \frac{0.7}{3} =$

$- 0.42 + \frac{0.7}{3} =$

$\frac{ - 1.26 + 0.7}{3} =$

$\frac{ - 0.56}{3} = - 0.18$