x²-(81-18x+x²)+2x>0
x²-81+18x-x²+2x>0
20x-81>0
Ответ: x>4.05
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x²-(81-18x+x²)+2x>0
x²-81+18x-x²+2x>0
20x-81>0
Ответ: x>4.05