小学二年级数学较复杂口算练习题(10)
奥数网
2016-09-22 18:13:17
99–9–40=
5+70–5=
9+7+20=
14–5+30=
30+6+4=
99–9–40=
5+70–5=
9+7+20=
14–5+30=
30+6+4=