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Afla nr necunoscute. A) 9820-x=1974 5002 -x=2153

Răspuns :

9820-x=1974
x=9820-1974
x=7846

5002-x=2153
x=5002-2153
x=2849
9820-x=1974
x=9820-1974
x=7846
Proba: 9820-7846=1974

5002-x=2153
x= 5002-2153
x= 2849
Probă: 5002-2849=2153