Даю 30 балів!!!!!!! (Використати формули скороченого множення)
1) (x + 3ay)²
2) (2a - 5b)²
3) (x + 3y)³
4) (2a - b)³
5) (x³ - 2y⁴)³
6) 5a²b + 15ab²
7) a²b + ab³
8) x²y - xy² - 9xy
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