下面GMAT思为大家整理了GMAT数学例题详解,供考生们参考,以下是详细内容。
6、
(1)XY=6;
(2)X+Y=5;
【答案】E
【思路】x,y 都有可能等于2或者3,所以无法判断
7、已知A0等于1,A1等于2,其后各项通式为:A=3A,问A5等于多少?
注:A0/A1/An/A中A后面为下标。
【答案】3528
【思路】好象只能一个个算,A2=311=3,A3=322=12,A4=3113=99,A5=39812=3528
8、1,2,3,...,9中取出两个数组成一个三位数(其中两个数相同),问有多少个数?
【答案】216
【思路】
第一种:C91C32C81=216,先任取一个数C91,因为三位数中有两个相同,就选C32来放这两个数,然后,再在剩下的8个数中任选一个放三位中空那个位置C81
第二种:C92 2 = 216,假设A,B两个数,若A重复,则一共有P3,3/P2,2个,还有一种可能就是B重复,又有P3,3/P2,2个,所以要乘以2
9、X,Y,Z是三角形的三个边,且X
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