Question

简便计算以下各题，要求过程。

Answer 1

219+450+302+150+381+98
=(219+381)+(450+150)+(302+98)
=600+600+400
=1600
327+103+148+97+52+173
=(327+173)+(103+97)+(148+52)
=500+200+200
=900
796-145+387+204-55+113
=(796+204)+(387+113)-(145+55)
=1000+500-200
=1300
672-198+328-147-202+196-253+404
=(672+328)-(198+202)-(147+253)+(196+404)
=1000-400-400+500
=700
7500-248-173-569-100-552-127-31-200
=7500-(248+552)-(173+127)-(569+31)-(100+200)
=7500-800-300-600-300
=5500
6033-496-(238+762)-1004-152-148
=6033-(496+1004)-1000-(152+148)
=6033-1500-1000-300
=3233