3+8+15+24+35+48+...+2400=?
0,-3,8,-15,24,-35,48,——
有理数题,8/3*3+16/15*15+24/35*35+32/63*63+40/99*99+48/143*143=?
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2=?
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=?急啊
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=?
巧算:8/3/3+16/15/15+24/35/35+32/63/63+40/99/99+48/143/143
巧算8/(3*3)+16/(15*15)+24/(35*35)+32/(63*63)+40/(99*99)+48/(14
数列3/2,8/3,15/4,24/5,35/6,48/7,求通项公式
找规律,0,-3,8 ,-15,24,-35,48,-63,——.
0,3,8,15,24,35,48,63 按照此规律写出第2004个数.
3,8,15,24,35,48,63,……,请问它的第36个数是多少?