4 6685 0000=4.6685亿≈4.67亿，
7 6908 0400=7.690804亿≈7.69亿，
206 0800 0000=206.08亿≈206.08亿，
9708 0000=0.9708亿≈0.97亿，
3 2060 0000=3.206亿≈3.21亿，
704 0090 0000=704.009亿≈704.01亿，
故答案为：=4.6685亿≈4.67亿，=7.690804亿≈7.69亿，=206.08亿≈206.08亿，=0.9708亿≈0.97亿，=3.206亿≈3.21亿，=704.009亿≈704.01亿．