考研记录#163
今天完成了线性代数部分第35到95共六十个题目,保持这个速度的话一千题二刷会在16号左右结束。今天学到了秩为一的矩阵的几个性质:1⃣️可以被写成一列乘一行2⃣️其n次方A^n=l^n-1A,其中l为tr(A)3⃣️其特征值有如下性质:λ1=trA,λ2=λ3=···=λn=0。以前写过,若aij=Aij,则A^T=A*,今天又学到了不光这样,A还为正交阵,即还等于A^-1。还有一个小性质,若A列满秩,则r(AB)=r(B)。
今天完成了线性代数部分第35到95共六十个题目,保持这个速度的话一千题二刷会在16号左右结束。今天学到了秩为一的矩阵的几个性质:1⃣️可以被写成一列乘一行2⃣️其n次方A^n=l^n-1A,其中l为tr(A)3⃣️其特征值有如下性质:λ1=trA,λ2=λ3=···=λn=0。以前写过,若aij=Aij,则A^T=A*,今天又学到了不光这样,A还为正交阵,即还等于A^-1。还有一个小性质,若A列满秩,则r(AB)=r(B)。
今日晨读
And I ain't trying to mess with
/ənd//aɪ//eɪnt//ˈtraɪɪŋ//tə//mes/
your self-expression.
/wɪð//jɔː//self ɪkˈspreʃən/
But I've learned the lesson that
/bət//aɪv//lɜːnd//ðə//ˈlesən//ðæt/
stressing and obsessing about
/stresɪng//ənd//əbˈsesɪng//əbaʊt/
somebody else is no fun.
/ˈsʌmbədi//els//ɪz//nəʊ//fʌn/.
And I ain't trying to mess with
/ənd//aɪ//eɪnt//ˈtraɪɪŋ//tə//mes/
your self-expression.
/wɪð//jɔː//self ɪkˈspreʃən/
But I've learned the lesson that
/bət//aɪv//lɜːnd//ðə//ˈlesən//ðæt/
stressing and obsessing about
/stresɪng//ənd//əbˈsesɪng//əbaʊt/
somebody else is no fun.
/ˈsʌmbədi//els//ɪz//nəʊ//fʌn/.
美式发音
And I ain't trying to mess with
/ənd//aɪ//eɪnt//ˈtraɪɪŋ//tə//mes//wɪð/
your self-expression.
/yɔr//self-ɪkˈspreʃən/
But I've learned the lesson that
/bət//aɪv//ˈlɝnd//ðə//ˈlesən//ðæt/
stressing and obsessing about
/stresɪng//ənd//əbˈsesɪng//əbaʊt/
somebody else is no fun.
/ˈsʌmbədi//els//ɪz//noʊ//fʌn/.
And I ain't trying to mess with
/ənd//aɪ//eɪnt//ˈtraɪɪŋ//tə//mes//wɪð/
your self-expression.
/yɔr//self-ɪkˈspreʃən/
But I've learned the lesson that
/bət//aɪv//ˈlɝnd//ðə//ˈlesən//ðæt/
stressing and obsessing about
/stresɪng//ənd//əbˈsesɪng//əbaʊt/
somebody else is no fun.
/ˈsʌmbədi//els//ɪz//noʊ//fʌn/.
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