Question

alguém me ajuda por favor, mt urgente​

Answer 1

Resposta:

x=(16-1)/90=15/90=1/6

y=0,25=1/4

z=-1/6

a)

x+y+z=1/6+1/4-1/6=1/4

b)

x-y+z=1/6-1/4-1/6=-1/4

c)

x-y-z=1/6-1/4+1/6

=2/6-1/4

=1/3-1/4

=(4-3)/12=1/12

d)

x+(y-z)=x+y-z=1/6+1/4+1/6

=2/6+1/4

=1/3+1/4

=(4+3)/12=7/12