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daca a+b=999, iar a-b=1, afla ce valoare are a. Dar b?

Răspuns :

se aduna cele doua relatii

a+b+a-b=999+1

2a=1000, a=500, b=999-a=999-500=499
a +b=999
a -b=1
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2a /=1000
a =500
a -b=1=>b=a-1=499