一年级口算题37
网络资源
2017-08-12 22:36:18
68-(38-30)=
9+28+20=
50-3+50=
60-(30+20)=
9+51-40=
9+(65-30)=
8+77+20=
41-41+10=
50+(43-30)=
21-3+8=
