2,3,4,5,6,7,8,15,17,18,19,20这个十二个数编加减乘除算式各一个,每

2,3,4,5,6,7,8,15,17,18,19,20这个十二个数编加减乘除算式各一个,每
2,3,4,5,6,7,8,15,17,18,19,20这个十二个数编加减乘除算式各一个,每

2,3,4,5,6,7,8,15,17,18,19,20这个十二个数编加减乘除算式各一个,每
7+8=15
19-2=17
3*6=18
20/5=4