Odpowiedzi

2009-11-24T17:13:25+01:00
1. 2x = 28+1/4x
8x = 112 + x
7x = 112
x = 16

2. 115/100 ----69
100/100 ---- x
x = 69 : 115/100
x = 6900 : 115
x = 60