34660=3.466万≈3.5万1998760000=19.9876亿≈20.0亿632700=63.27万≈63.3万856590000=8.5659亿≈8.6亿852600=85.26万≈85.3万544880000=5.4488亿≈5.4亿.故答案为:3.466,3.5;19.9876,20.0;63.27,63.3;8.5659,8.6;85.26,85.3;5.4488,5.4.