把算式寫完整.
327+915
=327+________+________+________
=________+________+________
=________+________
=________
705-398
=705-________+________
=________+________
=________.
900 10 5 1227 10 5 1237 5 1242 400 2 305 2 307
分析:根據(jù)整數(shù)加減法的運(yùn)算性質(zhì)進(jìn)行解答即可.
解答:327+915
=327+900+10+5
=1227+10+5
=1237+5
=1242
705-398
=705-400+2
=305+2
=307.
故答案為:900+,10,5,1227+,10,5,1237,5,1242,400,2,305,2,307.
點評:本題主要考查了學(xué)生對運(yùn)算定律的掌握情況.