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Calculati a-b-c=? stiind ca a+b=571,b+c=326 iar a+c==523. (explicarea exercitiului)

Răspuns :

326+523=849(a+b+2c)
849-571=278(2c)
278:2=139(c)
b+c=326
b+139=326
b=187
a+c=523
a+139=523
a=384
384-187-139=58