4. (2 б) Подайте вираз 0,09a²-81b² у вигляді добутку.
A) (0,3а-9b)²; Б) (0,03a-9b)(0,03a+9b); В) (0,3а-9b)(0,3а+9b); Г)(0,03a-9b)².​
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