①85-26-32=
②100-34+17=
③39+15+45=
④28+54-4
7×4=
31-28=
3×9=
5×7+18=
65-33=
8×9=
7×6=
6×8-6=
8×4=
19+50=
43+37=
3×9+3=
35+6=
28-22=
90+6=
77-26=
66-6=
45+5=
71-6=
93+4=
50+18-8=
78-65+20=
这周一共工作多少小时?