Question

Calculați folosind factorul comun
b)15+15•34+15•35
C)143+143•2+143•3+.....+143•11
d)5+10+15+....+45

Answer 1

b)15*(1+34+35)=15*70=1050 c)143*(1+2+... +11)=143*11*12/2=143*11*6=9438 d)5*(1+2+... +9)=5*9*10/2=5*9*5=225

Answer 2

b) factor comun e 15
15*(1+34+35)=15*70=1050
c)143*(1+2+3...+11)=143*(132:2)=143*66=9438
d) 5*(1+2+3+....9)=5*(90:2)=5*45=225