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问题 填空题

曲线y=x3-x2在点P（2，4）处的切线方程为______．

答案

由题意得，y′=3x2-2x，

则点P（2，4）处的切线斜率k=12-4=8，

∴点P（2，4）处的切线方程是：y-4=8（x-2），

即8x-y-12=0，

故答案为：8x-y-12=0．

填空题

主风机的两台油泵为（）。
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问答题

Third, we will integrate clean stoves into our international development projects so that refugee camps, disaster relief efforts, and long-term aid programs all will act as distribution networks. Women and girls who are obviously the vast majority of stove users will be our focus throughout. Women-owned, micro-financed businesses and networks can extend deep into hard-to-reach communities, and that I know a number of my friends from SEWA, the Self Employed Women’s Association that started in India, has already made a huge difference for millions of women in India. And they’re with us today; you’ll meet them in a minute. And they’re helping us to make this happen more broadly.
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