直接写得数。                                                                                                                                      

15﹣8＝	7+33＝	35+8＝	59﹣7＝
48﹣30＝	56+30＝	100﹣40＝	70﹣20＝
5+28＝	25+7＝	27﹣9＝	50﹣6＝