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首先暫時學左echelon form, reduce echelon form and triangular. 但每次見到題目話FIND THE GENERAL SOLUTION 我都唔知用邊個方法搵,因為有時大有FREE VARIABLE.
eg. 1  -2  7  -6
     0   1  -6   5
好似呢題我用R1+2R2=R2  R2= 0  0  -5  4   咁X1 同X2 會係FREE VARIABLE 但答案係得X3 係FREE VARIABLE 想問點解同咩情況下用咩



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row1 + 2 row2 does not produce
but instead gives you
.
The reduced row echelon form should be
and the free variables are x3 and x4.

[ 本帖最後由 ppresent 於 2017-10-1 06:30 PM 編輯 ]



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