??????????????????????????????????????????
??????????????????????????????????????????42÷6×2??
12÷4÷3??
36÷9×5??
144÷6÷4??
68??20÷2??
9×9??61??
72÷8??1??
99??9÷3??
8×5??14??
48??6÷3??
70??3??13??
53??37??4??
74??31??16??
6×8??3??
0×6??72??
47??11??21??
75??5×3??
6×4??61??
40÷4??5??
2×3??64??
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