问题
问答题
设区域D=(x，y)|1≤x≤2，0≤y≤x，x2+y2≥2x，求二重积分
答案
参考答案：[分析与求解] D是圆周x2+y2=2x((x-1)2+y2=1)的外部与△OAB={(x，y)|1≤x≤2，0≤y≤x
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设区域D=(x，y)|1≤x≤2，0≤y≤x，x2+y2≥2x，求二重积分
参考答案：[分析与求解] D是圆周x2+y2=2x((x-1)2+y2=1)的外部与△OAB={(x，y)|1≤x≤2，0≤y≤x
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We asked some teachers to give us the last lesson. The lesson is proverbs about friends. Older people _ 小题2:____ teach proverbs to younger people. Every culture has proverbs. They are short and easy to ___小题3: __. There is a German proverb which says, “Friendship is a plant we must __小题4:___.” It means that we need to take care of friends ___小题5:___ taking care of a garden. “Only your real friends will tell you when your face is dirty.” is _ 小题6:___ proverb from Japan. It means that only __小题7:___ friends tell you when you are making a __小题8:_____. My grandfather told me, “Nobody is so _ 小题9:____ that he can throw away a friend.” Everyone __小题10:____ friends. Be good to them. Goodbye, friends! Don’t forget us! |