Odpowiedzi

2010-02-03T10:05:14+01:00
X-wiek Danusi
y-wiek Basi

x=y+2
x+1=2(y+1)

x=y+2
y+2+1=2y+2

x=y+2
3-2=2y-y

x=y+2
1=y

x=1+2
y=1

x=3
y=1

Odp.Danusia ma 3 lata a Basia 1 rok
1 5 1
2010-02-03T10:06:28+01:00
X-wiek Basi
x+2 - wiek Danusi
x+1=½*(x+2+1)
x+1=½*(x+3)
x+1=½x+1½
x-½x=1½-1
½x=½/:½
x=1

1 4 1
2010-02-03T10:09:57+01:00
Danusia- x+2
Basia- x

x+1=1/2(x+2+1)
x+1=1/2x+1,5 |-1/2x
1/2x+1=1,5 |-1
1/2x=0,5 |-2
x=1

Danusia- 3
Basia- 1
1 3 1