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SAT数学练习题实例讲解(2).

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If 4 less than 3 times a certain number is 2 more than the number,what is the number? 这是SAT OG官方指南上的一道数学题,题目很简单,但是不懂题目就麻烦啦。跃跃给解释一下,大家看对不对哈。一个数的3倍减去4等于这个数加2,上等式:3x-4=x+2,x=3。这种less than/more than的题读起来总是很绕嘴,大家要学会断句,才好应对。 ————————————————————————————– Twenty percent less than 60 is one-third more than what number? A 16 B 30 C 32 D 36 E 48 再来一道less than/more than,看到这种题就懵的童鞋注意力要集中啦,比60少其20%的值比什么数多这个数的1/3,看不懂我翻译的直接看等式,60-60*20%=x+(1/3)x,x=36 ————————————————————————————– One-half of a number is 17 more than one third of that number. What is that number? 再来一道less than/more than的试题,这种题目直译都比较拗口,注意is在这里就相当于equal,看等式吧,(1/2)x=17+(1/3)x,x=102 ————————————————————————————– The first of a sequence of numbers is 1. If each term after the first product of -2 and the preceding term, what is the sixth term of the sequence 这里面有一个很重要的词product,在这里不是产品的意思,是乘积的意思。product of -2 and the preceding term:-2和前一个数的乘积,现在来解题,某个数列第一个数1,其后的每个数的值是前一个数和-2的积,如下:1,1*(-2),1*(-2)*(-2)…,问该数列的第六个数是多少,1*(-2)^5=-32 生词回顾:sequence数列,term项,product乘积,preceding之前的,前面的 ————————————————————————————– When a certain odd number is divided by 5, the remainder is 1. Which digit must be in the units place of this odd number? A. 1 B. 3 C. 5 D. 7 E. 9 有童鞋看不懂题意,跃跃说你是词汇量还不够,多努力背背吧。看一下题意:某个奇数被5除,余数是1(满足这样条件的奇数个位只能是1或6),请问这个奇数的个位数是多少。答案选A 生词回顾:odd奇数的,even偶数的,divide除,remainder余数、剩余,digit数字,unint个位 Let a “prd” number be dined as one in which the product of the positive divisors of the number, not including the number itself, is greater than the number. Which of the following is a “prd” number? A. 8 B. 15 C. 18 D. 21 E. 2 直接看一下网友翻译的吧,将“prd数”定义为这样一种数,它的正因数(不含它本身)的积大于它自身。问以下哪个是prd数?答案是C,因为18的正因数有2,3,6,9,其积大于18。 生词回顾:positive积极的,正的;divisor除数,约数,因子,还有divison、divide和divider;product乘积 ————————————————————————————– The sum of 8 positive integers is 31. If no individual integer value can appear more than twice in the list of 6 integers, what is the greatest possible value one of there integers can have.? 答案:15 解析: 这八个数是 1,1,2,2,3,3,4,? ?=15 看明白了嘛

SAT数学练习题实例讲解(2)SAT数学练习题实例讲解(2)

If 4 less than 3 times a certain number is 2 more than the number,what is the number? 这是SAT OG官方指南上的一道数学题,题目很简单,但是不懂题目就麻烦啦。跃跃给解释一下,大家看对不对哈。一个数的3倍减去4等于这个数加2,上等式:3x-4=x+2,x=3。这种less than/more than的题读起来总是很绕嘴,大家要学会断句,才好应对。 ————————————————————————————– Twenty percent less than 60 is one-third more than what number? A 16 B 30 C 32 D 36 E 48 再来一道less than/more than,看到这种题就懵的童鞋注意力要集中啦,比60少其20%的值比什么数多这个数的1/3,看不懂我翻译的直接看等式,60-60*20%=x+(1/3)x,x=36 ————————————————————————————– One-half of a number is 17 more than one third of that number. What is that number? 再来一道less than/more than的试题,这种题目直译都比较拗口,注意is在这里就相当于equal,看等式吧,(1/2)x=17+(1/3)x,x=102 ————————————————————————————– The first of a sequence of numbers is 1. If each term after the first product of -2 and the preceding term, what is the sixth term of the sequence 这里面有一个很重要的词product,在这里不是产品的意思,是乘积的意思。product of -2 and the preceding term:-2和前一个数的乘积,现在来解题,某个数列第一个数1,其后的每个数的值是前一个数和-2的积,如下:1,1*(-2),1*(-2)*(-2)…,问该数列的第六个数是多少,1*(-2)^5=-32 生词回顾:sequence数列,term项,product乘积,preceding之前的,前面的 ————————————————————————————– When a certain odd number is divided by 5, the remainder is 1. Which digit must be in the units place of this odd number? A. 1 B. 3 C. 5 D. 7 E. 9 有童鞋看不懂题意,跃跃说你是词汇量还不够,多努力背背吧。看一下题意:某个奇数被5除,余数是1(满足这样条件的奇数个位只能是1或6),请问这个奇数的个位数是多少。答案选A 生词回顾:odd奇数的,even偶数的,divide除,remainder余数、剩余,digit数字,unint个位 上12下

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