Odpowiedzi

2009-11-19T13:36:09+01:00
(1200/x +10)*(x-4) = 1200
(1200+10x)*(x-4) = 1200x
(120+x)*(x-4)=120x
120x-480+x²-4x=120
x²-4x-480=0
√Δ=44
x=4+44/2 = 24