Ответы на вопрос:
B(n) = b₁ + (n-1)*d = -0.8+(n-1)4 = -0.8+4n-4 = 4n-4.8 b(3) = 4*3-4.8 = 7.2 b(7) = 4*7-4.8 = 23.2 b(24) = 4*24-4.8 = 91.2 b(k+1) = 4(k+1)-4.8=4k-0.8
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