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第1题

1im x→0y→0 3xy/⺁2xy+1-1=() A. 不存在 B. 3 C. 6 D.
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第2题

设f(y-x,x/y)=y²-x²,则f(x,y)=() A. y²(1+x)/1-x B. y²(1-x)/1+x C. x²(1-x)/1+x D. x²(1+y)
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第3题

1.Oil is so important that it is sometimes called "black gold". Almost half of our energy comes from oil. We use it to r
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第4题

1.When people talk (1) the cities of the United States, the first that comes to mind is New York. New York is the larges
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