Odpowiedzi

2010-03-27T22:42:29+01:00
20x+21=67
20x=67-21
20x=46
x=46/20
x=2,3
2010-03-27T22:42:33+01:00
20x+21=67
20x = 67-21
20x = 46 |:20
x = 46:20
x = 2,3
2010-03-27T23:04:44+01:00
20x + 21 = 67
20x = 67 - 21
20x = 46 /:20
x = 46/20
x = 23/10
x = 2,3