3.设A= (} -5& 3& 1 2& -1& 1 ) . ,-|||-(1)求可逆矩阵P,使PA为行最简形矩阵;-|||-(2)求一个可逆矩阵Q,使QA^T为行最简形矩阵.

10.曲线 =dfrac ({x)^2+x}({x)^2-1} 的渐近线的条数为 () .-|||-(A) 0 (B)1 (C)2 (D) 3

9.(1)若两个向量组等价,则它们所含向量的个数相同;(2)若向量组 {a)_(1),(a)_(2),... ,(a)_(n)} -|||-线性无关, _(n+1) 可由α1,α2····α,线性表出,则向量组(a1,a2,···α,41)也线性无关:(3)-|||-设(a1,a2,···,an)线性无关,则(a1,a2,··· _{n-1)3 也线性无关:(4)(a1,a2,····α,)-|||-线性相关,则a,-定可由α1,α2,··· _(n)-1 线性表出:以上说法正确的有 () 个。-|||-A.1个 B.2个 C.3个 D.4个

设向量(alpha )_(1)=((1,1,-1))^T (alpha )_(2)=((0,2,1))^T,(alpha )_(1)=((1,1,-1))^T (alpha )_(2)=((0,2,1))^T, , 则 (alpha )_(1)=((1,1,-1))^T (alpha )_(2)=((0,2,1))^T,不能由(alpha )_(1)=((1,1,-1))^T (alpha )_(2)=((0,2,1))^T,线性表示。 ( )A. 对B. 错

证明方程^x-1+x-2=0仅有一个实根.

若在U^0(x0)内 (x)gt g(x) ,且limf(x)与lim g(x)都存在,-|||-则 lim _(xarrow {x)_(0)}f(x)gt lim _(xarrow {x)_(0)}g(x)() 。-|||-A.对 B. 错

求曲线 =sin x+cos x(xin [ 0,2pi ] ) 的拐点.

第一步：已知某高射炮对敌机进行射击，其击中敌机发动机、机舱及其他部位的概率分别为0.1,0.08,0.38，又若击中上述部位而使飞机坠落的概率分别为0.1,0.08,0.38。现在该炮任意发射一炮弹，问飞机坠落的概率为（ ）(保留小数点后两位，四舍五入）0.1,0.08,0.380.1,0.08,0.380.1,0.08,0.380.1,0.08,0.38第二步：若已知飞机被坠落，则击中敌机发动机的概率（ ）（保留小数点后两位，四舍五入）0.1,0.08,0.380.1,0.08,0.380.1,0.08,0.380.1,0.08,0.38

误差和偏差一般保持（）位有效数字。A. ．4B. ．3C. ．1-2D. ．随需要而定

下列关系式正确的是()。A. [x,hat(p)_y]=ihbar。B. (hat(A)hat(B))^dagger=hat(A)^daggerhat(B)^daggerC. (psi,hat(A)^daggervarphi)=(hat(A)psi,varphi);D. [hat(A)hat(B),hat(C)]=[hat(B),hat(C)]hat(A)+[hat(A),hat(C)]hat(B);

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