一年级复杂数学口算题之四
奥数网
2016-08-02 15:00:45
9+51-40=
9+(65-30)=
8+77+20=
41-41+10=
50+(43-30)=
21-3+8=
9+51-40=
9+(65-30)=
8+77+20=
41-41+10=
50+(43-30)=
21-3+8=