Răspuns :
pai grupezi in asa fel : 1. (1375+2625)+(1856+1144)=4000+3000=7000
2. (834+166)+(2573+3427)=1000+6000=7000
3. (712+1288)+(1876+2124)=2000+4000=6000
2. (834+166)+(2573+3427)=1000+6000=7000
3. (712+1288)+(1876+2124)=2000+4000=6000