Question

suma a 5 numere consecutive impare este 75.afla numerele.(prin metoda figurativa)

Answer 1

a+1  I---I+1
a+3  I---I+3
a+5  I---I+5
a+7  I---I+7
a+9  I---I+9           }75
egalam segmentele
75-(1+3+5+7+9) = 75-25 = 50
aflam cat reprezinta un segment
50:5 = 10
aflam numerele
a+1=10+1 = 11
a+3 = 10+3 = 13
a+5 = 10+5 = 15
a+7 = 10+7 = 17
a+9 = 10+9 = 19

Answer 2

a,b,c,d,e=numerele
a=a
b=a+2
c=a+4
d=a+6
e=a+8
a |-----|
          +2
b |-----|__|
           +2 +2
c |-----|__|__|
           +2 +2 +2
d |-----|__|__|__|
           +2 +2 +2 +2 
e |-----|__|__|__|__|
5a+2+2+2+2+2+2+2+2+2+2=75
5a+20=75
5a=55
a=11
b=13
c=15
d=17
e=19
sper ca te-am ajutat