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Calculeaza
21+[-57-(-39+5-18)]+26


Răspuns :

21+[-57-(-39+5-18)]+26=

21+[-57-(-52)]+26=

21+(-57+52)+26=

21+(-5)+26=

21-5+26=

16+26=

42

21 + [-57-(39+5-18)]+26

21+(-57-26)+26

21-31+26

-10+26

16

coronita pls