Răspuns:
a) 4+2×3 => 4=2×2 factor comun 2
2×(2+3)=2×5=10
b) 3×4+9 => 9=3×3 factor comun 3
3×(4+3)=3×7=21
c) 11+22+33+44+55 => factor comun 11
11×(1+2+3+4+5)=11×15=165
d) 6+9+18 => factor comun 3
3×(2+3+6)=3×11=33
e) 30+40+180 => factor comun 10
10×(3+4+18)=10×25=250
f) (101+202+303+404): 101 => factor comun 101
101×(1+2+3+4):101=101×10:101=1010:101=10
Sper ca te-am ajutat!!