简便计算99✖️98+200

如题所述

99×98+200
=(99+1)×98+102
=100×98+102
=9800+102
=9902
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第1个回答  2017-05-25
99×98+200
=(100-1)×98+200
=100×98-98+200
=9800-98+200
=9702+200
=9902