GRE Quantitative Reasoning Introduction
机考 section-level 自适应性考试,可翻页可修改
2 sections:20 questions/35min/ per section
题型:
1.数量比较题
2.单项选择题
3.不定项选择题
4.数字填空题
一.算术
整数的属性和类型(可分性、因式分解、质数、余数、奇偶数)
算术运算、指数、根式
概念:百分比、比率、比例、绝对值、数轴、十进制、数列
余数因子类问题
基本概念:
Positive Integer, quotient, remainder Factor(divisor), prime factor, multipleCommon factor, common multiple
y/x= y is divided by x
y is divisible by x
x is a factor of y
x is a divisor of y
y is a multiple of x
100以内的质数prime number:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97 (共25个)
余数定理
1.余同取余
一个数除以4余1,除以5余1,除以6余1,则可表示为60N+1
2.和同取和
一个数除以4余3,除以5余2,除以6余1,则可表示为60N+7
3.差同取差
一个数除以4余1,除以5余2,除以6余3,则可表示为60N-3
小结:
①质因数
②A=B·k
③a^b与a,distinct prime factor
④a·b=LCM×GCD
⑤N=2×3×5×7
=2^2×3^5×5^2 number of prime factors
⑥余/除=decimal part
⑦x/a=Q···R x=aQ+R
⑧X=7a+3=2b+5
⑨(M·N)mod a=(M mod a)·(N mod a)mod a
①what fraction of A is B: B/A
②A→B
the precentage increase from A to B
(B-A)/A·100%=100(B-A)/A%
③the ratio of A to B: A/B
④a→b
increase by what factor from a to b: b/a
①a+b-x+e=Total
②a+b+c-2x-y+e=Total
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