36a²-81= (6а-9)(6а+9)
25x²-10xy+y² = (5х -у)² = (5х -у)(5х -у)
16x²+9у²+24xy = (4х+3у)² = (4х+3у)(4х+3у)
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36a²-81= (6а-9)(6а+9)
25x²-10xy+y² = (5х -у)² = (5х -у)(5х -у)
16x²+9у²+24xy = (4х+3у)² = (4х+3у)(4х+3у)