如题所述
198x49十2X49简便计算
=(198+2)x49
=200x49
=9800
=(198+2)x49
=200x49
=9800
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第1个回答 2019-03-27
=(198+2)×49
=200×49
=9800本回答被提问者采纳
=200×49
=9800本回答被提问者采纳