Tính nhẩm a) 8 . 24 . 6 + 12 . 4 . 52 + 2 . 22 . 24 b)18. 58 . 2 - 9 . 27 . 4 + 12 . 69 . 3 c)30 . 85 . 3 + 18 . 72 . 5 - 45 . 37 . 2 - 9 . 20 . 10

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