Question

Va rog ajutatima va dau puncte si coroana calculati folosind factorul comun 
a13*5+13*21+13*40 b
49*135-49*27+49*11 c 2+4+6+8+10+12

Answer 1

a) 13*5+13*21+13*40=13(5+21+40)=858
b) 49*135-49*27+49*11=49(135-27+11)=5831
c)2+4+6+8+10+12=2(1+2+3+4+5+6)=2*6*7/2=42