Question

1) Considere x = 0.33..., y=-1,66... e z=0,25 e resolva as expressões a seguir.
a) x - y + z
b) y-- (x + 2z)
c) y - x

Answer 1

Resposta:

x = 0.33...=3/9=1/3

y=-1,66...=(16-1)/9=-15/9 =-5/3

z=0,25=25/100=1/4

a) x - y + z

=1/3-(-5/3)+1/4

=1/3+5/3+1/4

=6/3+1/4

=2+1/4

=8/4+1/4

=9/4

=2,25

b) y- (x + 2z)

=-5/3-(1/3+2/4)

=-5/3-(1/3+1/2)

=-5/3-(2/6+3/6)

=-5/3-5/6

=-10/6-5/6

=-15/6

=-5/2

=-2,5

c) y - x

=-5/3-1/3

=-6/3

=-2