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k/x = (c + d)/2
2k = x(c + d)
x = 2k/(c + d)
zad 4
z - zegarek
p - pasek
z + p = 135
0,9z + (p + 2) = 125
z +p = 135 stąd z = 135 - p wstawiamy do drugiego równania
0,9z + p = 125 - 2 = 123
0,9(135 - p) + p = 123
121,5 - 0,9p + p = 123
0,1p =123 - 121,5 = 1,5
p = 1,5 : 0,1 = 15
z + p = 135
z + 15 = 135
z = 135 - 15 = 120
odp
zegarek kosztuje 120 zł , a pasek 15 zł