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Afla nr necunoscute 63:9×a=49 b:7=64:8 72:c=56:7

Răspuns :

63:9xa=49
7xa=49
a=49:7
a=7

b:7=64:8
b:7=8
b=8x7
b=56

72:c=56:7
72:c=8
c=72:8
c=9
63:9×a=49
7×a=49
a=49:7
a=7

b:7=64:8
b:7=8
b=7×8
b=56

72:c=56:7
72:c=8
c=72:8
c=9

Coroana?