45+345+30 58-358-30 50+1717+50
69-2187-20 3+5555-3 30个一3个十
20﹣6=
80+18=
3+54=
98﹣60=
75﹣30=
8+60=
32﹣9=
78﹣6=
57+20=
75+9=
26+8=
46﹣40=
12 - 5 =
19 - 7 =
41 - 8 =
17 + 8 =
34 + 6 =
41 + 30=
25 - 9 =
31 - 5 =