的绝对值很容易看出为9的倍数选择E
考点:凑的方法,要掌握好选数的区别性,比如此题中,五位数的头和尾如果都是单数,那么差值必定是双数,无法排除A,D选项。而用严谨的方法做题时,要大胆假设,不要担心未知数个数多,就不敢假设。最后都可以消掉的。
7.比大小
解答:1/=100/97 ; 1.03=103/100 大于1的分数,上下同时加一个数,变小A
考点:分数比大小
8.The original value of machine X is V dollars, while the original value of machine Y is 2V dollars. Both machines depreciate in value at a constant rate of 10 percent of their original value per year.
翻译:X机器的原价为V,Y机器的原价为2V,每年都贬值原价的10%,比大小
解答:A= V0.9^3
B= 2V 0.9^6
B/A = 20.9^3 = 1.458 1 BA 选B
考点:对贬值概念的理解
9.If n is an odd integer, which of the following in the square of the next larger odd interger?
A. n^2+1
B. n^2 + 4
C. n^2 + 2n +1
D. n^2+4n+4
E.n^2+n+1
翻译:n是偶整数,那么下列哪么是邻近的比n大的偶整数的平方
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