在横线里填上“＞”“＜”或“=”．
0.49       0.499               4.12       4.23               12.00     12
3.0       2.999               2.620      2.62              0.98       1
0.82千克       820克                 7米23厘米       7.2厘米    9.27吨       9吨27千克
1.004千米      1千米40米．