O conjunto dos valores assumidos pela expressão  \frac{a}{|a|} + \frac{b}{|b|} + \frac{c}{|c|} + \frac{abc}{|abc|}
Quando a, b, c são números reais não nulos é:
(a) {−4, −3, −2, −1, 0, 1, 2, 3, 4}
(b) {−4, −2, 0, 2, 4}
(c) {−4, 0, 4}
(d) {4}
(e) R
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