下列关于公差d＞0的等差数列{an}的四个命题： p1：数列{an}是递增数列；p2：数列{nan}是递增数列；p3：数列 {ann} 是递增数列；p4：数列{an+3nd}是递增数列；其中真命题是

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下列关于公差d＞0的等差数列{a_n}的四个命题：

p₁：数列{a_n}是递增数列；

p₂：数列{na_n}是递增数列；

p₃：数列 {

a

n

} 是递增数列；

p₄：数列{a_n+3nd}是递增数列；

其中真命题是（）

A：p₁，p₂

B：p₃，p₄

C：p₂，p₃

D：p₁，p₄

上一题下一题 0.0难度选择题更新时间:2019-11-21 03:01:36

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D

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There is a new park near Andy's home. It's fine today. Andy and his family are in the park now. On their left, there is a café. On their right, there is a big lake. There are many flowers and trees around the lake. There's a small hill behind the lake. Near the lake, there are two signs. One says, “Don't swim in the lake!” The other says, “No fishing!” But you can go boating on the lake. There is a beautiful garden in the middle of the park. There are green grass and beautiful flowers in it. There are some small shops between the lake and the garden. The park is so beautiful. Andy and his family like it very much.

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