5. (2/3-2/15)•(3,5-12,75) = -4.9
8. х²+х-2 = (x - x) (x + x) - 2 = 2
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5. (2/3-2/15)•(3,5-12,75) = -4.9
8. х²+х-2 = (x - x) (x + x) - 2 = 2