Question

Ajudaaa!! Porfavor
Sendo x= 5^-1 e y= -9^-1
a) x+Y=
b) x-Y=
C) x/Y=
d) x.Y=

Answer 1

a) x+y = 
5^-1 + -9^-1
$\frac{1}{5}$ + $\frac{1}{-9}$ =
$\frac{4}{45}$

b) x-y=
5^-1 -9^-1 =
1/5 + 1/9 =
14/45

c) x/y = 
$\frac{1/5}{1/-9}$ = 
9/5

d) x.y = 
1/5.1/-9 =
-1/45