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in doua moduri repede mersi

In Doua Moduri Repede Mersi class=

Răspuns :

salcam   /___/
tei         /___/...54.../                 total=72

72-54=18
stabilim egalitatea
18:2=9 salcami
9+54=63 tei

proba: 9+63=72

varianta 2
s+t=72
t=s+54
inlocuim necunoscutele
s+s+54=72
2s+54=72
2s=72-54
2s=18
s=18:2
s=9 salcami

t=9+54
t=63 tei