37-6+20=
60-4-30=
25+5-9=
42+(12-3)=
58+(26-6)=
84-(32+8)=
19◯7◯2=10 16◯9=14◯7 6◯6=18◯6
20◯5◯5=10 15◯7=4◯4 20◯10=5◯5
先算:
再算:
48-7= 6+51= 68-40= 30+53= 100-60=
57+6= 63+5= 90-50= 86-5= 21+13=
3×4= 94-60= 48-8+40= 45-40+ 32=
44+33=
27+12=
47-25=
92-81=
41+48=
88-38=
85-40=
20+80=
59-50=
37+13=
50-7=
45-6=
5+37=
78+20=
38+9=
28-9+40=
45-40+32=
28-10+9=
25+9-6=
14-9= 11-7= 12-8= 9+4-5=
15-9= 7+8= 16-8= 17-9-2=
14-7= 12-3= 17-8= 16+2-7=
9+=17 20+=74 36+= 52
17-9= 74-20= 52-36=