Fill in the brackets with 3, 6, 18 and 54, and each number can only be used once, () △ () × () = ()
impossible
If you want to fill in ABCD in turn, you will find that after dissolving it is AC = BD
However, 3 = x 6 = 2x 18 = 6x 54 = 18x is obviously impossible to meet the above requirements
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