Răspuns:
a) 4x={40}
b) 2a={20}
c) 31a={310}
e) 3xxx={3000}
f) a31b={1310, 2310, 3310, 4310, 5310, 6310, 7310, 8310, 9310}
g) aa7b={ 1170, 2270, 3370, 4470, 5570, 6670, 7770, 8870, 9970}
