198+197-196-195+194+193-192-191+190+189+.-4-3+2+1
=(198-196)+(197-195)+(194-192)+(193-191)+.+(6-4)+(5-3)+2+1
=[(198-3+1)/2] * 2+2+1
= 196+2+1
=199
198+197-196-195+194+193-192-191+190+189...-4-3+2+1=?
198+197-196-195+194+193-192-191+190+189...-4-3+2+1=?
数学人气:242 ℃时间:2020-05-16 21:24:37
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