如题所述
第1个回答 2010-12-30
203 × 199 = 203 × 200 - 203 = 40600 -203 = 40397
第2个回答 2010-12-30
=203*(200-1)
=203*200-203*1
=40600-203
=40397本回答被提问者采纳
=203*200-203*1
=40600-203
=40397本回答被提问者采纳
第3个回答 2010-12-30
203*199
=203*(200-1)
=203*200-203*1
=40600-203
=40600-(200+3)
=40600-200-3
=40400-3
=40397
=203*(200-1)
=203*200-203*1
=40600-203
=40600-(200+3)
=40600-200-3
=40400-3
=40397
