This is because we can interpret the 1st step of GE as
This assume no pivoting GE == A=LU
-l2 µ½ -lmÊÇÓÃÀ´°ÑA(1)¶ÔÓ¦µÄ position±ä³É0µÄ¡£ÄDZ߶¼ÊÇ£¬ ±ÈÈçµÚ¶þÐУ¬-l1 * A[1, 1] + 1 * A[2, 1] = 0
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