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2014-05-27T14:11:18+03:00
A)a-b=3784
a+1720-b-1720=3784
a-b=3784 adevarat
b)a-b=2715
a-820-b+820=2715
a-b=2715
adevarat deoarece -820+820=0
c)a-b=1214
a+500-b+500=1214
a-b+1000=1214
a-b=1214-1000
a-b=214 fals
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