SAT数学练习题实例讲解(2)

2022-05-26 19:04:55

  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。

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  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

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  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

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  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

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  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 +

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