Question

Suma a 5 nr consecutive impare este 75. Afla nr
Prin metoda figurativa

Answer 1

a |-----|
b |-----|+2|
c |-----|+2|+2|
d |-----|+2|+2|+2|
e |-----|+2|+2|+2|+2|              } 75.

75 - 20 = 55 ( 5 parti egale)
55 : 5 = 11 (a)
11 +2 = 13 (b)
11 +2 +2 = 15 (c)
11 +2+2+2 = 17 (d)
11 +2+2+2+2 = 19 (e )
Verificare : 11 +13 + 15 +17 +19 = 75.

Answer 2

a|---|
b|---|+1
c|---|+1+1
d|---|+1+1+1
e|---|+1+1+1+1. }75

egalare: 75-10=65
a=65:5
a=13
b=13+1
b=14
c=13+2
c=15
d=13+3
d=16
e=13+4
e=17

verificare: 13+14+15+16+17=27+15+16+17=
42+16+17=58+17=75