Răspuns :
a+a+1+a+2+a+3+a+4=140;
5a=140-10;
5a=130;
a=130:5;
a=26;
a+1=27;
a+2=28;
a+3=29;
a+4=30
a+a+1+a+2+a+3+a+4=140
5a+10=140
5a= 130
a=36
a+1=37
a+2=38
a+3=38
a+4=39
5a+10=140
5a= 130
a=36
a+1=37
a+2=38
a+3=38
a+4=39