2. Дано: -4<а<3. Оцініть значення виразу:
1) a-7;
2) -2a;
3) 2а-6;
4) 5-3a.
3. Дано: 4<а<7 і 3 1) ab;
2) 2a-5b;
3) 4b/9a
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