Решение:

1) (5 × 8) + 7 = 47

5×8=40

40+7=47

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2) (9 + 9) × 9 = 162

9+9=18

18×9=162

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3) (9 - 9) : 9 = 0 или (9 - 9) × 9 = 0

9-9=0                        9-9=0

0:9=0                        0×9=0

Ответ: