Question

suma a 4 nr consecutive este 42 prin metoda figurativa

Answer 1

a=|----|
b=|----|+1
c=|----|+1+1
d=|----|+1+1+1
Scadem diferenta si avem
42-6=36
36:4=9
a=9
b=9+1=10
c=9+1+1=11
d=9+1+1+1=12
9+10+11+12=42(verificare)

Answer 2

Nr.1=|---| $\left \{42}$ Nr.2=|---|-|(+1) Nr.3=|---|-|-|(+2) Nr.4=|---|-|-|-|(+3) 4a+1+2+3=42 4a+6=42⇒ 4a=42-6 4a=36 a=36:4 a=9 ⇒nr1=9 Nr2=10 Nr3=11 Nr4=12