(a) If (A|B) can be obtained from (C|D) by a finite sequence of elementary
column operations, then the systems Ax=B and Cx=D are equivalent
False
=========
(d) If (A|B) is in row echelon form, then the system AX=B must have a solution
False
============
(c) If a system of linear equations has two different solutions,
then it must have infinitely many solutions
False
請問這些是為什麼?
謝謝
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