Question

1. Efetue as multiplicações:
a) 1973 · 1,7 =
b) 50,23 0,03 =
54 84
c)
39
5
d) (-39) - (13)
e) (-9).-
2​

Answer 1

Explicação passo-a-passo:

C)

$\frac{54}{39} \frac{84}{5} \\ \frac{18}{13} \times \frac{84}{5} \\ \frac{18 \times 84}{13 \times 5} = \frac{1512}{13 \times 5} \\ \frac{1512}{65}$

D)

$( - \frac{36}{17}) \times ( \frac{45}{13}) \\ - \frac{36}{17} \times \frac{45}{13} \\ - \frac{36 \times 45}{17 \times 13} = - \frac{1620}{17 \times 3} \\ - \frac{1620}{221}$

E)

$( - \frac{86}{5}) \times ( - \frac{50}{2} ) \\ \frac{86}{5} \times \frac{50}{2} = \frac{86}{5} \times 25 \\ 86 \times 5 = 430$