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x2 = 1/3
persamaan kuadrat:
x² - (x1+x2)x + x1.x2 = 0
x² - ((1/2)+(1/3)x + (1/2)(1/3) = 0
6x² - 5x + 1 = 0.................opsi E
40. 4x² + 5x + 1 = 0
(4x+1)(x+1) = 0
x = -1/4 atau x = -1.............opsi A