a²-c²=(a-c)*(a+c)
2a-3b≥0
81а²-16(2а-3b) =(9а-4√(2а-3b))*(9a+4*(2a-3b))
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a²-c²=(a-c)*(a+c)
2a-3b≥0
81а²-16(2а-3b) =(9а-4√(2а-3b))*(9a+4*(2a-3b))