以下为大家连载GMAT数学考试备考宝书,费费数学宝典,希望大家备考顺利,成绩高高,都能申请到理想的美国大学!
6、1+X+X^2+X^3+X^4+X^51/?
(1)X0
(2)X1
【答案】C
【思路】
(1)不可。因x=1搞定。
(2)不可。
(1)(2)合起来,1-x^20,可以。
+ x^2+X^41/
+x^2+x^41
1
+ x^41
1-x^4+x^4-x^61
1-x^61
7、N为1-99之间的整数,问满足N被3整除的N的概率。
【答案】2/3
【思路】
1、2、3中,2、3两个数符合条件n能被3整除的条件,由于3个数一循环,所以比例为2/3。
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