Care este raspunsul?
Dau coroana celui mai bun răspuns

a+a+2+a+4+a+6+a+8+a+10=a+6+219
6a+30=a+225
6a-a=225-30
5a=195
a=195:5
a=39
a+2=39+2=41
a+4=39+4=43
a+6=39+6=45
a+8=39+8=47
a+10=39+10=49
Verific:
suma lor=a+6+219=45+219=264
39+41+43+45+47+49
80+43+45+47+49
80+90+45+49
170+45+49
215+49
264 ✔