文档介绍：200+180=
56+125=
400-70=
71+28=
35:5=
90+150=
6x8=
36-18=
910-90=
38:7=
220+150=
6x9=
78:9=
45-27=
720-180=
9x9=
290-40=
770-160=
6x7=
40:8=
600+270=
620+150=
3x7=
7x7=
37:6=
56:9=
760+100=
750+125=
200+50=
430+27=
4x6=
19:8=
720-70=
820-128=
33-17=
71-43=
81:9=
72:8=
71-24=
250-60=
66:8=
5x5=
28:7=
33:6=
15+43=
58-36=
6x6=
60+350=
840+90=
5x9=
43:7=
460-72=
13:6=
9x4=
34+23=
34+56=
30+540=
620-57=
11:5=
67-53=
220+170=
4x7=
19:6=
21:6=
69+32=
680-120=
770+630=
3x3=
52+81=
9x9=
83:9=
330-172
8x6=
62+52=
38+52=
5x6=
41:5=
75+75=
70+18=
5x4=
36:6=
70-18=
900-80=
70+450=
36:7=
44:6=
58+14=
78-23=
94-46=
7x8=
8x7=
52:7=
6x4=
500+700=