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1) -9х(х²+1)-(х-3)²+9(x³+1)
2) 25х² - 20ху + 4у²
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10ху - 4у²
1) -9х(х²+1)-(х-3)²+9(x³+1)
2) 25х² - 20ху + 4у²
-------------------------
10ху - 4у²
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