| (估算)49×104≈________×________=________ | (估算)98÷51≈________÷________=________ |
| 估算过程:49≈________;104≈________ | 估算过程:98≈________;51≈________. |
| (估算)49×104≈________×________=________ | (估算)98÷51≈________÷________=________ |
| 估算过程:49≈________;104≈________ | 估算过程:98≈________;51≈________. |