(5х+3)^2-(5x-3)^2/x=((5х+3)+(5x-3)*((5х+3)-(5x-3))/x=10x*6/x=60
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------------------------- = ----------------------------------- = ---------= 60
x х х
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(5х+3)^2-(5x-3)^2/x=((5х+3)+(5x-3)*((5х+3)-(5x-3))/x=10x*6/x=60