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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
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
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