把算式寫完整.
327+915
=327+
900
900
+
10
10
+
5
5

=
1227
1227
+
10
10
+
5
5

=
1237
1237
+
5
5

=
1242
1242

705-398
=705-
400
400
+
2
2

=
305
305
+
2
2

=
307
307
分析:根據(jù)整數(shù)加減法的運算性質(zhì)進行解答即可.
解答:解: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:本題主要考查了學生對運算定律的掌握情況.
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把算式寫完整.
327+915
=327+________+________+________
=________+________+________
=________+________
=________
705-398
=705-________+________
=________+________
=________.

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