问题
问答题
求曲线y=ex和y=x，x=1，y轴所围成的平面图形的面积S；
(2)求(1)中的平面图形绕x轴旋转一周所成旋转体的体积Vx．
答案
参考答案：
解析：解 画出平面区域，如图9-3所示的阴影区域．
(1)
(2)
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求曲线y=ex和y=x，x=1，y轴所围成的平面图形的面积S；
(2)求(1)中的平面图形绕x轴旋转一周所成旋转体的体积Vx．
参考答案：
解析：解 画出平面区域，如图9-3所示的阴影区域．
(1)
(2)
| 阅读短文,根据短文内容完成表格,每空一词。 | ||||||||||
| I have always loved cars. After graduating from college, I got one, which I regarded as (把……当作)my favorite friend.I called it Victor. For the next three years, everything I did was connected with(与……有关)Victor. I lived a happy life. But because of money problems, I had to sell Victor. Then my life broke down. Without Victor, I was like a fish out of water. Three months later, with the encouragement of my friends, I decided to start a new life. I tried and made it. Everything went well again. Losing my car made me grow up. I have learned that life won't always go our way, but we can chose to be positive(积极的)and make the best of it. | ||||||||||
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