20+80=
[ ]
A.29
B.51
C.85
D.100
90-5=
49-9=
A.9
B.40
C.48
D.82
86-4=
42+6=
一支铅笔的价钱是
[
A
B
选一选
62-40=
A.0
B.22
C.28
78-50=
59-30=
A.25
B.26
C.29