Răspuns :
x3+9y+11
dam factor comun 3:
3(x+3y)+11=? dar x+3y=10
deci 3×10+11=30+11=41
deci
x3+9y+11=41
dam factor comun 3:
3(x+3y)+11=? dar x+3y=10
deci 3×10+11=30+11=41
deci
x3+9y+11=41