4. (4t - 3t + 6t) • (-1) + t + 6 при t = 11 5. (11x • 4 + 3 • 4x) : 8 - 7x при x = 2 1/3
6. 5ab - 3a + 6ab + 8b + 5 при a = 1 , b = 3

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