（）．

A α₁，α₂，α₃ B α₂，α₃，α₁ C α₂，α₁，α₃ D α₃，α₂，α₁

A ①收敛，②收敛 B ①收敛，②发散 C ①发散，②收敛 D ①发散，②发散

A 函数f(x)有2个极值点，曲线y=f(x)有2个拐点 B 函数f(x)有2个极值点，曲线y=f(x)有3个拐点 C 函数f(x)有3个极值点，曲线y=f(x)有1个拐点 D 函数f(x)有3个极值点，曲线y=f(x)有2个拐点

A f₁(x)≤f₂(x)≤g(x) B f₂(x)≤f₁(x)≤g(x) C f₁(x)≤g(x)≤f₂(x) D f₂(x)≤g(x)≤f₁(x)

A <img src="https://www.beizhujiaoyu.com/uploads/202208/162139028251891.png" width="85" height="19" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/162139028638121.png" width="85" height="19" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/162139029122431.png" width="84" height="19" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/162139029782061.png" width="83" height="20" />

A A^T与B^T相似 B A^-1与B^-1相似 C A+A^T与B+B^T相似 D A+A^-1与B+B^-1相似

A a>1 B a<-2 C -2<a<1 D a=1或a=-2