Răspunsuri

  • Utilizator Brainly
2014-09-16T16:05:38+03:00
A+b+c=?

a+b=197
b+c=188
a+c=171 adunam cele trei relatii si obtinem 
________

2a+2b+2c=556 / :2
a+b+c=278

197+c=278
c=278-197
c=81

a+188=278
a=278-188
a=90

a+b=197
90+b=197
b=197-90
b=107
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