2. а) Упростите выражение: (2x – 5)2 + (3х – 5)(3х + 5) + 52х
[3]
b) Покажите что значение выражения
(2x – 5)2 + (3х – 5)(3х + 5) + 52х при х = -2 равно -12. [1]​
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