Răspuns :
a) a + b + c = 111 × 10
a + b + c = 1 110
a + b = 110
b + c = 1 100
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1 110 - 1 100 = 10 ( a )
110 - 10 = 100 ( b )
1 100 - 100 = 1 000 ( c )
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b) a + b + c = 333 x 10
a + b + c = 3 330
a + b = 330
b + c =3 300
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3 330 - 3 300 = 30 ( a )
330 - 30 = 300 ( b )
3 300 - 300 = 3 000 ( c )