1)A=10x+y+10y+5+60+x
A= 11x+11y+65
A=65+11(x+y) : 11 (trebuiau 3 puncte)
2)B=500+10x+y+100x+30+y +100x+10y+7
B= 537 +210x +22y
B= 3(179+70x) +22y : 3 (trebuiau 3 puncte)
3)C=10x+y+10y+z+11z+x
C=11x+11y+11z
C=11(x+y+z) : 11 (trebuiau 3 puncte)
4)D=100x+10y+2+100y+10z+3+ 100z+10t + 4+100t+10x+1
D=110x+110y+110z+110t+10
D=5(22x+22y+22z+22t+2) :5 (trebuiau 3 puncte)