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Un = -4² + 12n
U10 = -4² + 12 * 10
= 16 + 120
= 136
U7 = -4² + 12 * 7
= 16 + 84
= 100
U10 / U7 = 136 / 100 = 1,36
U7 = -4²+12(7) = -16 + 84 = 68
U10/U7 = 104/68 = 26/17= 1 9/17