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Ex.5
Calculati numarul necunoscut:

448:a=8
Dx7=497
693:e=3
H:7=567
Mx5=355
R:9=981



Răspuns :

448:a=8
a=448:8=56

Dx7=497
D=497:7=71

693:e=3
e=693:3=231

H:7=567
H=567x7=3969

Mx5=355
M=355:5=71

R:9=981
R=981x9=8829