软件简介： 一年级（上）口算练习 
10-4=          1+5=                  8-0=                        5+2=                   6+4=
10-10=        8-4=                   2+6=                       7-5=                    1+3=
9-1=            2+7=                  10-1=                      10-7=                  5+4=
9-5=            8-6=                   10-9=                      8-3=                    6-2=