综上所述,答案如下, a& v$ q4 B. k: g( s
1O4=10 =1+2+3+4=105.39.217.77:8898% p+ ~6 g& T1 z0 x. d( z
2O6= 20 =2+3+4+5+6=20
: Y3 H& O" N# t' v7 m) C* X3O5=12 =3+4+5=12tvb now,tvbnow,bttvb! {9 d. a$ f! B
4O8=30 =4+5+6+7+8=30tvb now,tvbnow,bttvb% K' u Z$ P* a* d N6 d: `
5O10=? =5+6+7+8+9+10=45 |