[转帖]6月17日北美JJ

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分数不高，但已够申请学校。谢谢CD！！！特别感谢iamwwh AI　N25 AA N38 Maths 1. 0.1/100与下面哪个值相等 2. 从1到20连续整数中取5个，这5个中有10和20的概率是多少 3. 10单位重的R由A和B组成，70%是A，30%是B，问需要从R中拿走多少单位并补上同样重的B，才能使B在R中占的比重是50% 4. －1＜K＜0，问哪个值最大　（A）1＋K　（B）1－K　（C）1－1/K方 (D)1－1/K (E)1+1/k 5. a1=0, a2=1,a3=2,　若an 是3an-1+2an-2+an-3的算术平均数, n>=4,求a5是多少 6. ｛X｝表示＜＝X的最大整数，问｛X｝＝1？　A　X＞1　　B　X＜2 7. 已知s=n*(n+1)/2，　求50---100的和 8. If x and y are positive, is x3 > y? (1) x的平方根> y (2) x > y 9. 假设X，　问它的十位数是多少　（A）X*10的百位数是2（B）？？？（反正不是） 10. 60件衣服，红1有＊，白的有＊，蓝的有＊，红2有＊，问从中任选一件，不是红的可能性。 11. （1-1/11）(1-1/12)(1-1/13)(1-1/14)(1-1/15)=?
CR The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality. The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity. If the statements above are all true, which of the following conclusions is best supported by them? A. When an olive oil is refined, the concentration of oleic acid in the oil is reduced.
B. The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.
C. If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
D. Free oleic acid is the only acid that unrefined olive oil contains.
E. People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste. 只能想起这么多了，抱歉。