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1.If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as I = 1000 {(1 + r/100)n – 1}, and the annual interest rate is r percent, is r > 8 percent? (1)The deposit earns a total of $210 in interest in the first 2 years. (2)(1 + r/100)2 > 1.15 答案选d 条件2 是怎么推出来的呢 我越算与复杂了 有什么简便方法吗
2. M = {-6, -5, -4, -3, -2} T = {-2, -1, 0, 1, 2, 3} If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?答案徐D 好心人帮我列一下式子吧 顺便讲一下 吧 我排列组合很差 A.0 B.1/3 C.2/5 D.1/2 E.3/5
3.Is 12 a factor of the positive integer n? (1)n is a factor of 36. (2)3 is a factor of n.答案选E 做这样的题 有什么窍门吗 每次一遇到这样的题就不会做了 帮我讲讲吧
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