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Translate the following sentence into English.你讲什么内容并不重要,重要的是你必须要演讲。
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Direction: Fill in the blanks with the words given below. Change the form if necessary.[vain; frame; curve; twist; comb; collapse; scatter; scratch; rebuild; harsh]5. The horses liked this grooming, and I think, if they could talk, they would tell you where to[填空1]or comb.
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Direction: Fill in the blanks with the words given below. Change the form if necessary.[expand; abuse; knowledge; narrative; plantation; property; oppressive; extremely; rebel; abolitionist]6. If someone takes away your[填空1]in that country, you have no recourse.
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Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]1. My dear, do not[填空1]such gloomy thoughts. Let us hope for better things.
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Direction: Fill in the blanks with the words given below. Change the form if necessary.[dodge; mean; tease; disability; regular; bonus; proclaim; universal]7. Hell be glad to be in[填空1]work again.
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设函数f: R+?R, f(x)=x2-3x-5,试求其单满双射性质。
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求集合 A={2, 3, 4}上的恒等关系、全域关系、小于等于关系和整除关系。
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设函数f: N?N, f(x)=2x+1,试求其单满双射性质。
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设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R1={|x, y∈Xùxy},则求R1(1)。
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设函数f: N?N, f(x) = (x)mod 3, x 除以 3 的余数,试求其单满双射性质。