7.
S=ab
5·3,5≤S≤5,5·4
17,5cм²≤S≤22cм²
8.
неравенство верно при любом значении a
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7.
S=ab
5·3,5≤S≤5,5·4
17,5cм²≤S≤22cм²
8.
неравенство верно при любом значении a