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Ответ

Проверено экспертом

Ответ дан
7x8

7.

S=ab

5·3,5≤S≤5,5·4

17,5cм²≤S≤22cм²

8.

(a+3)(a-5)>(a-7)(a+5)\a^2-5a+3a-15>a^2+5a-7a-35\a^2-5a+3a-15-a^2-5a+7a+35>0\20>0

неравенство верно при любом значении a

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