ab=10a+b
ba=10b+a
inlocuiesti si obtii
10a+b+10b+a=11a+11b=11(a+b)=.>a+b=11
a=2 b=9 ab=29
a=3 b=8 ab=38
a=4 b=7 ab=47
a=5 b=6 ab=56
a=6 b=5 ab=65
a=7 b=4 ab=74
a=8 b=3 ab=83
a=9 b=2 ab=92
3) x=nr elevi in prima clasa
x-5 nr de elevi in cls 2
x+3 nr elevi in cls3
Pui problema in ecuatie
x+x-5+x+3=94
3x-2=94
3x=94=2
3x=96
x=96:3=32 levi cls 1
cls2=32-5=27
cls3 32+3=35
