Question

看谁算得又对又快。
39-7-9=                                  48-9-6=
19-7-3=                                  58-20-9= 
40-5-8=                                  72-30-8= 
92-72-8=                                80-2-50= 
90-40-25=                              83-4-40=

Answer 1

23；33；9；29；27；34；12；28；25；39