2000×199.9-1997×199.8的简便计算
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2000×199.9-1997×199.8的简便计算
![2000×199.9-1997×199.8的简便计算](/uploads/image/z/5671795-67-5.jpg?t=2000%C3%97199.9-1997%C3%97199.8%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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
=2000×199.9-2000×199.8+3x199.8
=2000x(199.9-199.8)+3x(200-0.2)
=2000x0.1+3x200-3x0.2
=200+600-0.6
=799.4