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 HKGC 高級會員 帖子685 積分815 註冊時間2010-9-12 [純數] 有關SYSTEM OF LINEAR ALGEBRA 問題求高手入 #1 發表於 2017-10-1 06:03 AM  只看該作者 繁 簡 [按此打開] [隱藏] 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 .postmorevideochannel { margin-top: 10px; display: block; width: 160px; height: 30px; background: url('/images/video_channel_more.png?v=20160829b') no-repeat; font-size: 0; } .postmorevideochannel:hover, .postmorevideochannel:focus { background-position: 0 -30px; } @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) { .postmorevideochannel { background: url('/images/video_channel_more_2x.png?v=20160829b') no-repeat; background-size: 100% auto; } }
 ppresent 一星級會員 帖子89 積分94 註冊時間2015-9-12 #2 發表於 2017-10-1 06:24 PM  只看該作者 繁 簡 row1 + 2 row2 does not produce $%5Cbegin%7Bpmatrix%7D%200%20%26%200%20%26-5%264%20%5Cend%7Bpmatrix%7D$ but instead gives you $%5Cbegin%7Bpmatrix%7D%201%20%26%200%20%26-5%264%20%5Cend%7Bpmatrix%7D$. The reduced row echelon form should be $%5Cbegin%7Bpmatrix%7D%201%20%26%200%20%26-5%264%20%5C%5C%200%20%261%20%26-6%26%205%20%5Cend%7Bpmatrix%7D$ and the free variables are x3 and x4. [ 本帖最後由 ppresent 於 2017-10-1 06:30 PM 編輯 ] .postmorevideochannel { margin-top: 10px; display: block; width: 160px; height: 30px; background: url('/images/video_channel_more.png?v=20160829b') no-repeat; font-size: 0; } .postmorevideochannel:hover, .postmorevideochannel:focus { background-position: 0 -30px; } @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) { .postmorevideochannel { background: url('/images/video_channel_more_2x.png?v=20160829b') no-repeat; background-size: 100% auto; } }