Question

următorul exercițiu
metoda grafică

Answer 1

Numerele pare consecutive

1 nr /-----/

2 nr /-----/+2

Dublul sumei celor doua nr pare consecutive:

/-----/------/

/-----/------/+2+2

total 84

egalizam segmentele

4segmente+4=84

4segmente=84-80=80

1segment=80:4=20

primul numar = 1 segment = 20

al doilea numar = 1 segment + 2 = 20 + 2 = 22

Answer 2

(a+b)*2=84

a;b=> nr pare consecutive...=> b=a+2

a)|__|

b)|__|+2

------------

2a+2=84:2

2a+2=84:2

2a+2=42

2a=42-2

2a=40

a=40:2

a=20

b=20+2

b=22

(20+22)*2=

=42*2

=84