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-% MH-20210116
-
-# 原解
-
-~~~
-1 * 5 = 5
-
-2 * 4 = 8
-
-3 * 3 = 9
-~~~
-
-# 扩展
-
-~~~
-6 = 3 + 3 = 3 + 3 + 1 - 1 = 3 + 1 + 3 - 1 = (3 + 1) + (3 - 1)
-
-(3 + 1) * (3 - 1) = 3 * 3 + 3 * (-1) + 1 * 3 + 1 * (-1) = 3 * 3 + 1 * (-1) = 3 * 3 - 1 ^ 2 = 3 ^ 2 - 1 ^ 2
-
-3 ^ 2 > 3 ^ 2 - 1 ^ 2
-~~~
-