Question

Urgente!

Se x=
$\frac{ - 2}{5}$
e y=
$\frac{4}{7}$
Quanto é:

$a) \: x + y = \\ b) \: y \: . \: x = \\ c) \: x^{2} = \\ d) \: y^{2} =$
​

Answer 1

Explicação passo-a-passo:

× + y = - 2/5 + 4/7

= - 14/35 + 20/35

= 6/35

y . x = 4/7 . (- 2/5)

= - 8/35

x² = (-2/5)² = 4/25

y² = (4/7)² = 16/49