|
15-8= |
44+9= |
50+8= |
|
20+3= |
9+20= |
58-8= |
|
8+80= |
1+70= |
45+8= |
|
3+70= |
5+30= |
85-80= |
|
9+7= |
70+8= |
14-8= |
12-3=65-60=9+9=84-4=
57-7=12-5= 13-8=30+7=
8+30=80+4=15-9=12-8=

![]()
26+4065 18+3030+18 344+40
50-550-6 35+2057 4553-9
![]()

方法一: ![]()
方法二: ![]()
![]()
B . 13-5= 6+9= 11-3= 8+8=
10-7= 18-9= 12-6= 9+7=
35-5= 50+3= 67-60= 8+90=