Решите пожалуйста.......​

5.6 ≤ a ≤ 5.8

12.1 ≤ b ≤ 12.2

S = a*b

5.6*12.1 ≤ a*b (S) ≤ 5.8*12.2

67.76 ≤ S ≤ 70.76

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5.6 + 12.1 ≤ a + b ≤ 5.8 + 12.2

17.7 ≤ a + b ≤  18

2*17.7 ≤ 2(a+b) (P) ≤ 2*18

35.4 ≤ P ≤ 36