文档介绍：31+5×8=
36+3×2=
67+2×7=
50+2×2=
12+7×8=
8×2+21=
3×4+36=
3×6+68=
4×6+68=
7×5+23=
7×3-11=
7×7-11=
7×3-19=
9×7-36=
7×9-51=
26-5×3=
58-5×5=
94-6×9=
62-8×2=
57-7×6=
87-37+27=
87-56+25=
70-37+40=
67-36+27=
96-87+89=
51+12-38=
18+64-62=
34+31-12=
11+65-22=
19+73-79=
47+31+12=
17+39+28=
13+37+26=
20+16+24=
35+42+19=
96-13-48=
87-20-14=
33-16-16=
95-12-45=
85-12-56=
28+67=
18+65=
21+36=
29+18=
13+46=
17+62=
28+49=
34+31=
53+13=
22+62=
29+53=
32+26=
24+73=
45+52=
33+31=
15+23=
31+17=
22+55=
29+15=
27+33=
21+33=
58+14=
22+63=
37+38=
25+62=
32+22=
29+46=
44+12=
35+58=
45+13=
36-25=
41-25=
37-11=
59-12=
76-61=
76-28=
97-34=
64-23=
41-27=
33-22=
74-34=
43-23=
29-17=
53-31=
69-12=
68-41=
44-25=
76-48=
85-22=
91-72=
61-25=
73-42=
46-21=
52-15=
33-16=
81-19=
71-47=
77-46=
66-51=
97-46=
14+9×3=
51+2×2=
76+4×3=
81+2×2=
23+5×7=
5×6+31=
3×8+49=
7×8+15=
5×9+25=
2×9+15=
7×9-20=
5×8-32=
7×8-43=
6×6-23=
5×7-24=
86-7×2=
62-4×5=
26-2×9=
93-3×3=
78-7×3=
71-51+20=
45-23+53=
57-36+23=
97-95+90=
89-82+32=
66+24-32=
66+21-70=
25+71-17=
60+29-28=
25+15-12=
35+22+18=
12+19+32=
14+58+21=
29+29+38=
13+35+28=
88-21-48=
72-29-30=
85-46-29=
94-67-16=
64-37-15=
13+36=
54+28=
41+11=
32+17=
48+33=
53+37=
26+27=
42+51=
23+21=
39+24=
66+18=
32+55=
29+43=
55+23=
11+33=
49+37=
15+33=
55+19=
29+59=
18+12=
12+21=
63+34=
16+18=
63+26=
18+78=
11+39=
27+56=
79+15=
58+25=
12+25=
93-79=
82-17=
76-44=
78-15=
71-54=
64-51=
98-75=
84-39=
89-23=
83-55=
76-16=
67-54=
49-11=
68-12=
75-63=
91-57=
81-18=
59-39=
95-32=
47-13=
79-64=
96-65=
82-56=
79-28=
71-41=
81-27=
75-32=
79-52=
51-34=
98-63=
49+4×6=
21+9×7=
50+4×7=
30+6×3=
54+3×5=
3×8+40=
7×6+40=
3×4+47=
6×6+28=
8×3+55=
5×8-38=
7×4-15=
5×6-13=
9×3-21=
6×9-30=
87-7×9=
54-4×6=
49-4×7=
93-8×4=
39-3×6=
23-12+52=
87-73+70=
43-31+60=
93-79+39=
77-60+30=
20+22