Question

Afla valoarea lui a,b ,c stind ca :
a +b +c =870; a + b =644; b + c = 453

Answer 1

a+b+c=870 a+b=644 b+c=453
644 +c=870
c=870 -644
c=226
a+453 =870
a=870 -453
a=417
417 +b=644
b=644 -417
b=227

Answer 2

a+b+c=870
a+b=644
b+c=453
inlocuim
644+c=870
c=870-644
c=226
b+c=453
b+226=453
b=453-226
b=227
a+b=644
a+227=644
a=644-227
a=417
417+227+226=870