20+19+18+17+16+15+14+13+12-1-2-3-4-5-6-7-8 =(

20+19+18+17+16+15+14+13+12-1-2-3-4-5-6-7-8 =( )×( )
2025-04-26 22:59:54
推荐回答(2个)
回答1:

20-8=12,19-7=12,18-6=12,17-5=12,16-4=12,15-3=12,14-2=12,13-1=12,+12
综上所以=9×12

回答2:

等于 12×9