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Scrieti numarul 115 ca suma a cinci numere consecutive


Răspuns :

a+a+1+a+2+a+3+a+4=115
5a+10=115
5a=115-10
a=105:5
a=21
nr sunt 21,22,23,24,25

a+(a+1)+(a+2)+(a+3)+(a+4)=115
5a+10=115
5a=115-10
5a=105
a=105:5
a=21
b=21+1=22
c=21+2-23
d=21+3=24
e=21+4=25
Verificare:21+22+23+24+25=115