Află termenul necunoscut, folosind metoda mersului invers. Verifică rezultatul.
•a+12-36=94
•b-56+38=40
•74-c-26=45
•68-d+39=100.
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Răspuns:
a+12-36=94
a+12=94-36
a+12=58
a=58-12 a= 46
Explicație pas cu pas:
b-56+38=40 b-56=40-38 b-56=2 b= 56+2 b=58 74-c-26=45 74-c=45+26 74-c=71 c= 74-71 c=3. 68-d+39=100 68-d=100-39 68-d=61 d= 68-61 d=7. Proba 46+12-36=94 58-56+38=40 74-3-26=45 68-7+39=100