将下面的数先改写成用“亿”作单位的数,再写出它们的近似数(得数保留两位小数).561570000=______亿≈______亿744710000=______亿≈______亿673090000=______亿≈______亿633190000=______亿≈______亿.
561570000=5.6157亿≈6亿; 744710000=7.4471亿≈7亿; 673090000=6.73009亿≈7亿; 633190000=6.3319亿≈6亿; 故答案为:5.6157,6;7.4471,7;6.73009,7;6.3319,6. |