一年级复杂数学口算题之三
奥数网
2016-08-02 15:00:29
6+20+30=
68-(38-30)=
9+28+20=
50-3+50=
60-(30+20)=
6+20+30=
68-(38-30)=
9+28+20=
50-3+50=
60-(30+20)=