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10?9?9=81
6?8?8=40
9?3?3=30
8?8?8=8
16?4?5=20
7?7?9=40
? inseamna cat: plus/minus/impartit/inmultit


Răspuns :

10×9-9=90-9=81

6×8-8=48-8=40

9×3+3=27+3=30

8+8-8=16-8=8

16:4×5=4×5=20

7×7-9=49-9=40