设函数f(x)在x=x₀处有2阶导数,则

A ①② B ①④ C ①③④ D ②③④

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164060514698721.jpg" alt="" /> B 1/3 C <img src="https://www.beizhujiaoyu.com/uploads/202208/164060518830471.jpg" alt="" /> D 2/3

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164060262878621.jpg" alt="" width="160" height="45" title="" align="" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164060263676691.jpg" alt="" width="180" height="51" title="" align="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164060264444721.jpg" alt="" width="180" height="53" title="" align="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164060265573871.jpg" alt="" width="180" height="47" title="" align="" />

A (-1,1) B (-1,2) C (-∞,1) D (-∞,2)

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164060561152091.jpg" alt="" width="280" height="34" title="" align="" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164060562053371.jpg" alt="" width="280" height="34" title="" align="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/1640605629191.jpg" alt="" width="400" height="33" title="" align="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164060563745591.jpg" alt="" width="400" height="33" title="" align="" />

A I₁<I₂<I₃ B I₃<I₁<I₂ C I₂<I₁<I₃ D I₁<I₃<I₂

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164060289931041.jpg" alt="" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164060293319991.jpg" alt="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164060302881401.jpg" alt="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164060306060631.jpg" alt="" />

A 无解 B 有解 C 有无穷多解或无解 D 有唯一解或无解

A {λ|λ∈R} B {λ|λ∈R，λ≠-1} C {λ|λ∈R，λ≠-1，λ≠-2} D {λ|λ∈R，λ≠-2}