Question

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Answer 1

Resposta:

15.

a) [x] = 4

[4] = 4

x = 4

b) [x] = 2/5

[0,4] = 2/5

x = 0,4

c) [x^2 - 81] = 0

[9^2 - 81 = 0

[81 - 81] = 0

x = 9

d) [x - 2] = 7

[9 - 2] = 7

[7] = 7

x = 9