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Sa se calculeze c-b+a stiind ca:
a+100=b+1 800-c- 2 900=4 000


Răspuns :

a+100=b+1 800-c-2900=4000 b-a-c-1200=4000 b-a-c=5200 inmultim cu (-1) c-b+a= - 5200
a+100=b+1 800-c-2900=4000 b-a-c-1200=4000 b-a-c=5200  c-b+a= - 5200