探讨一种独特的数学问题，即寻找所有可能的乘积，这些乘积由1到9的所有数字恰好使用一次构成，并求这些乘积的总和。提示：某些乘积可能通过不同方式获得，请确保最终求和中只计算一次。
We shall say that an n-digit number is pandigital if it makes use of all the digits 1 to n exactly once; for example, the 5-digit number, 15234, is 1 through 5 pandigitial.
The product 7254 is unusual, as the identity, 39 X 186 = 7254, containing multiplicand, multiplier, and product is 1 through 9 pandigital.
Find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigital.
HINT: Some products can be obtained in more than one way so be sure to only include it once in your sum.
找出1-9数字组成乘积/乘数的总和
The product 7254 is unusual, as the identity, 39 X 186 = 7254, containing multiplicand, multiplier, and product is 1 through 9 pandigital.
Find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigital.
HINT: Some products can be obtained in more than one way so be sure to only include it once in your sum.
找出1-9数字组成乘积/乘数的总和
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