100+99+98/2*(-1)
=199-49
=150
用简便方法来计算100+99-98+97-96+.+3-2+1
用简便方法来计算100+99-98+97-96+.+3-2+1
数学人气:199 ℃时间:2019-08-26 06:55:24
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