曲线在处的切线的斜率是（）_刷题宝

题干

曲线

在

处的切线的斜率是（）

A：

B：

C：

D：

上一题下一题 0.0难度选择题更新时间:2018-01-08 10:21:40

答案(点此获取答案解析）

C

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During the summer holiday, my grandparents went to China. First they flew to Beijing from London. Then they went to Guangzhou by train.

When they wentto my home, I wanted to help my grandpa carry his heavy bag, but he did himself. They bought many presents for us. I got a dress. My brother got a toy plane. They brought many dried fruits for us, which they grew by themselves. My grandparents are farmers. They are hard-working people.

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Nancy enjoyed herself so much ______ she visited her friends in Sydney last year.

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一切从实际出发是唯物主义的根本要求，也是***的优良传统和我们做好各项工作的基本保证。在实际生活中，一切从实际出发的首要前提是

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下图中的各种设计，以能够减小压强为目的的是（）

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已知各项都为正数的数列{a_n}满足a₁=1，a_n²﹣（2a_n_﹣₁﹣1）a_n﹣2a_n_﹣₁=0（n≥2，n∈N^*），数列{b_n}满足b₁=1，b₁+

\frac{1}{2}

\frac{1}{3}

\frac{1}{n}

b_n=b_n₊₁﹣1（n∈N^*）

（Ⅰ）求{a_n}，{b_n}的通项公式；

（Ⅱ）求数列{a_n•b_n}的前n项和为T_n．

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