2100—299—298—············—2-1=?
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2100—299—298—············—2-1=?2100—299—298—············—2-1=?2100—299—298—············—2-1=?不知道你学了数
2100—299—298—············—2-1=?
2100—299—298—············—2-1=?
2100—299—298—············—2-1=?
不知道你学了数列没有
299+298+.+2+1=299*(299+1)/2=44850
2100-299-298-.-2-1=
2100-(299+298+.+2+1)
2100-44850=-42750
2100—299—298—············—2-1=?
·——·—·—··—·—·—···—··—· ——··—— ···—··———···—· —·—————··—· ···—··—·—·—— ——··——·—···· —·—·——
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