a) (5a-a)² =16a²
б) (ax+9)² =a²x²+18ax+81
в) (2-10b)² = 100b²-40b +4
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a) (5a-a)² =16a²
б) (ax+9)² =a²x²+18ax+81
в) (2-10b)² = 100b²-40b +4