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  • Utilizator Brainly
2014-10-14T15:09:29+03:00
A+b+c=18
2a+b+2c=25  adunam cele doua relatii si rezulta
___________
3a+2b+3c=43

2a+b+2c=25
a+b+c=18      scadem cele doua relatii si rezulta
 ____________
a + c= 7

(a+c)x(3a+2b+3c)=7x43=301
2 5 2