(9999+9997+···+9001)—(1+3+5+····+999)=?
3个回答
(9999+9997+···+9001)—(1+3+5+····+999)
=(9999+9901)×50/2-(1+999)×500/2
=497500-250000
=247500
相关问题
(9999+9997+.+9001)-(1+3+.+999)
(9999+9997+.+9001)-(1+3+.+999)=?
1+3+5+7+.+99=( ) 1+3+5+7+.+997+999=( ) 1+3+5+7+.+9997+9999(
10000-9999+9998-9997.6-5+4-3+2-1=?
9999+9998+9997+9996+4+3+2+1=
9999+9998+9997+9996.
10000-9999+9998-9997+9996-9995..+6-5+4-3+2-1等于多少?
求解一道小学三年级的数学题10000-9999+9998-9997******+8-7+6-5+4-3+2-1=?
1991+1993+1995+1997+……+9991+9993+9995+9997+9999=?
9+99+999+9999+9999+99999=?