2000×199.9-1997×199.8
=2000×199.9-2000×199.8+3x199.8
=2000x(199.9-199.8)+3x(200-0.2)
=2000x0.1+3x200-3x0.2
=200+600-0.6
=799.4
2000×199.9-1997×199.8的简便计算
2000×199.9-1997×199.8的简便计算
数学人气：209 ℃时间：2020-03-28 10:13:38
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