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calculeaza (a-c):10 stiind ca a+b=59si ca b+c=39


Răspuns :

(a-c)= a+b-(b+c)= a+b -b-c = a-c

a-c=59-39=20

(a-c):10= 20:10=2
a+b   =59
   b+c=39
-------------- "-"
a+b-b-c=a-c=59-39=20
(a-c):10=20:10=2