Odpowiedzi

2010-04-13T16:54:36+02:00
X+x+7 /2 = 20 /* 2
x+x+7 = 40
2x = 40 - 7
2x = 33 /:2
x = 16,5
2010-04-13T16:55:50+02:00
(x+x+7):2=20
2x+7:2=20/*2
2x+7=20*2
2x+7=40
2x=40-7
2x=33
x=16,5
2010-04-13T16:59:42+02:00
(x+x+7):2=20
2x+7:2=20/*2
2x+7=40
2x=40-7
2x=33
x=16,5