Odpowiedzi

2010-01-30T19:07:27+01:00
10 / x = [ 10 +290]/[x +30] = 300/[x + 30]
10*(x +30) = 300*x
10x + 300 = 300x
300x - 10 x = 300
290x = 300
x = 300/290 = 30/29
10/(30/29) = 10*(29/30) = 290/30
Spr.
290/30 = [290 + 290]/[30 +30 ] = [2*290]/[2*30] = 290/30
Odp. 290/30