Réponse:
3500=35000000
48000=0.000048
0,021=2100000
1. 35000000; 3,5×10⁷
2.0,000048; 4,8×10-⁵
3. 2100000; 2,1×10⁶
4.0,0000045; 4,5×10-⁶
5. 6500000; 6,5×10⁶