在下面的横线里填上合适的数.
| 1997600≈________万 | 548609001≈________亿 | 7290000=________万 | 5________8609001≈6亿. |
| 70+95=________ | 320÷40=________ | 3+ | |
| 1- | 4+0.7=________ | 1÷ | |
| 2- | 5+ | 8÷0.98=________. |
| 1997600≈________万 | 548609001≈________亿 | 7290000=________万 | 5________8609001≈6亿. |
| 70+95=________ | 320÷40=________ | 3+ | |
| 1- | 4+0.7=________ | 1÷ | |
| 2- | 5+ | 8÷0.98=________. |