Ответы и объяснения

2012-05-29T20:38:43+04:00

((√t+3)/(√t-3)- (√t-3)/(√t+3)): (2√t)/(9-t) = (((√t+3)^2-(√t-3)^2)/(t-9))*(9-t)/2√t =

= (t+6√t+9-t+6√t-9)/(t-9)*-(t-9)/2√t = 12√t/t-9*-(t-9)/2√t = -6