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a+b=10
a+ b+ c=15
2c + c = 15
3c = 15
c=5
a.b.c = 45
a.b.5 = 45
a.b = 45/5
a.b = 9
donde:
a=1
b=9
o
a=9
b=1
a= 1 ó 9
b= 9 ó 1
c= 5