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Calculeaza tinand cont de legatura dintre adunare si scadere. 20+30=□□; □□+□□=□□; □□-□□=□□; □□-□□=□□; 21+23=□□; □□+□□=□□; □□-□□=□□; □□-□□=□□; 45-2=□□; □□+□=□□; □□+□=□□; □□-□=□□;


Răspuns :

Răspuns:

20+30=50 20+20=40 50-30=20 60-30=30 21+23=54 65+11=76 41-31=10 43-32=11 45-2=43 56+4=60