26.7-17.5=9.2;
26.7
;?17.5 9.2
61.6+31.9=93.5;
61.6
;+31.9 93.5
30-1.65=28.35;
30
;?1.65 28.35
24.08+4.33=28.41;
24.08
;+4.33 28.41
验算:
4.33
;+24.08 28.41
67.08-7.58=59.5;
67.08
;?7.58 59.05
验算:
59.05
;+7.58 67.08
32.5+17.45=49.95;
32.5
;+17.45 49.95
验算:
17.45
;+32.5 49.95
45.8-22.27=23.53;
45.8
;?22.27 23.53
验算:
22.27
.+23.53 45.80