2. Scrieți numerele naturale care au a) 3 × 10² +4 × 10' +5×; 10°; b) 5× 10³ + 1 - 10'+9 × 10°; c)2 - 10⁴ +3× 10³ +0× 10² + 4 × 10' +6×10° d) a - 10⁴ +0 - 103 + b × 10² +6×10' + 3.​