12.95+5.5=18.45;
12.95
+ 5.5
.
18.45
15-9.85=5.15;
15
- 9.85
.
5.15
验算:
5.15
+ 9.85
.
15.00
29+8.68=37.68;
29
+ 8.68
.
37.68
验算:
37.68
- 8.68
.
29.00
12.95+5.5=18.45;
12.95
+ 5.5
.
18.45
15-9.85=5.15;
15
- 9.85
.
5.15
验算:
5.15
+ 9.85
.
15.00
29+8.68=37.68;
29
+ 8.68
.
37.68
验算:
37.68
- 8.68
.
29.00