口算
你能说一说 48-20 是怎么算得吗？
48
53
70
41
28
50 - 30=
83 + 6 =
40+50 =
88 – 5 =
20
89
90
83
75-20 =
40+44=
40+26=
26+50=
62-30 =
50+27=
84
66
55
76
32
77
45+3 =
23+30=
90-20=
48-7 =
48-20=
