直接写出得数。                                                                                                                                      

54÷9＝	9×7＝	65÷8＝	7000﹣2000＝
320+500＝	60+70＝	2600﹣800＝	4000﹣700＝
31﹣12÷4＝	9+2×4＝	6×8﹣8＝	72÷（3×3）＝