34+5=
20+40=
16-9=
26+3=
8+7=
7+4=
28+50=
30-10=
13-4=
32+30=
14-7=
17-8=
15+4=
12-5=
4+9=
8+7-9=
14-8=
16-9=
15-6=
17-8+5
57-7=
40+5=
70+8=
80-50-10=
8+20=
57-50=
35-5=
14-5+90=
17-9=
32-30=
70-40+4=
5+43=
46-6=
29+20=
16-8+20=
70+25=
26+40=
89-7=
42-2-20=
73-70=
7+62=
15-7=
4+3+60=
45+345+30 58-358-30 50+1717+50
69-2187-20 3+5555-3 30个一3个十
23+35= 76-73= 88-72= 6+43=