D(X-3Y+1)=（）

A ①② B ①④ C ①③④ D ②③④

A 有最大值，有最小值 B 有最大值，没有最小值 C 没有最大值，有最小值 D 没有最大值，没有最小值

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 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}

A 1/8 B 1/6 C 1/3 D 1/2

A -0.6 B -0.36 C 0 D 0.48