25+8=
53-5=
75+10=
63-40=
46-20=
62-10=
29+5=
34+20=
18+30=
7+50=
55-5=
74-8=
6×5= 5×2= 80-8= 72-50=
3×5= 4×4= 9+48= 20+39=
5+2×6= 6×4-8= 25+17-25= 4×5+7=
24÷4= 想口诀: