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Scrie numerele 21,27,30,15, ca sumă de 2 termeni

Răspuns :

14+7=21
19+8=27
29+1=30
7+8=15
21=20+1sau18+3 etc
27=20+7sau10+17etc
30=10+20sau19+21etc
15=10+5sau3+12etc