直接写得数                                                                                                                                      

100-50＝	23＋58＝	210－70＝	4＋3×9＝
6×9＝	32÷4＝	8÷8＝	（30－12）÷2＝
16÷8＝	330＋28＝	4×7＝	27÷3＋15＝