23,15,21,18,,19,21,17,(),()

2025-06-28 21:36:36
推荐回答(2个)
回答1:

原式=(15+24)+(16+23)+(17+22)+(18+21)+(19+20)=5*(15+24)=5*39=195

回答2:

解:
23,15,21,18,,19,21,17,(24),(15)