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Cel mai inteligent răspuns!
2014-10-14T16:25:04+03:00

a)   -7+2-[4+12]=-7+2-16=11  b)-2-143+[27-(-17-49)]=-2-143+[27+66]=-2-143+93=-52

c)21-(-20)+(22-18)-(-15-25)=21+20+2+40=83


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