Răspuns:
a) 6000 + 700 + 40 + 2 = 6 × 1000 + 7 × 100 + 4 × 10 + 2
b) 3000 + 200 + 20 + 3 = 3 × 1000 + 2 × 100 + 2 × 10 + 3
c) 5000 + 400 + 10 + 7 = 5 × 1000 + 4 × 100 + 1 × 10 + 7
d) 7000 + 100 + 20 + 7 = 7 × 1000 + 1 × 100 + 2 × 10 + 7
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