口算。                                                                                                                                      

65×2＝	390÷30＝	4.7＋3.5＝	2－0.8＝
0.28×1000＝	0.96÷10＝	0.9－0.23＝	0.13＋0.3＝
2.9－1.85＝	2.17＋0.9＝	15×9＋15＝	125×8÷125×8＝