Question

Aflati doua nr. consecutive stiind ca suma lor este 41.

Answer 1

a----- primul număr
b---- al doilea număr

b=a+1

a+a+1=41
2a+1=41
2a=41-1
2a=40
a=40÷2
a=20

b=20+1
b=21

VERIFICARE :
20+21=41

Answer 2

$\text {Metoda~grafica~:}$

a |-----| } 41
b |-----|-1-|

41-1=40 (2 segmente egale)
40:2=20 (1 segment)

a=20
b=21



$\text {Metoda~algebrica~:}$

a+a+1=41
2×a+1=41
2×a=41-1
2×a=40
a=40:2
a=20
a+1=21