Lasttime,heofferedtodomyhomeworkforme,butI.()A.refusedB.refuseC.haverefusedD.willrefuse
Last time,he offered to do my homework for me,but I ____________.( )
A. refused
B. refuse
C. have refused
D. will refuse
设A,B都是n阶方阵,|A|≠0,(B-I)-1=(A-I)T,求证:B可逆. 2020-05-14 …
设A为n阶矩阵,满足AA′=I(I是n阶单位矩阵,A′是A的转置矩阵),|A|<0,求|A+I|. 2020-05-14 …
1.All but one ____ here just now.A.is B.was C.has 2020-05-16 …
看看这个matlab程序错在哪了t=0:0.01:3;k=2;a=-1.5;b=10;f=k*ex 2020-05-16 …
A:I can’t find my bag.Have you seen it?0 - 离问题结束还 2020-05-16 …
v,w是n维向量,矩阵A=I-vw^T,若矩阵A可逆,并且A的逆阵是I-cvw^T,这里c是某个数 2020-06-18 …
连词成句1.Tom,have,and,Jack,baseballs,three2.Ella,does 2020-10-30 …
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functionf=myfun(x)矩阵定义省略forj=1:28a=0;fori=1;27;a=a 2020-11-01 …
设A为n阶方阵,A≠0且A≠I.证明:A2=A的充分必要条件是r(A)+r(A-I)=n. 2020-12-31 …