947+372+28-247
698-275+102-25
第1个回答 2012-04-22
947+372+28-247
= (947-247) + (372+28)
= 700 + 400
= 1100
698-275+102-25
= (698+102) - (275+25)
= 800 - 300
= 500本回答被提问者采纳
= (947-247) + (372+28)
= 700 + 400
= 1100
698-275+102-25
= (698+102) - (275+25)
= 800 - 300
= 500本回答被提问者采纳