3
9
16
36
49
单选题For all positive integers a and b, let (a|b)=(a-b)/(a+b) If m is a positive integer, what is (m|2m) ?A -1/2B -1/3C 1/3D 1/2E 2
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单选题现有: public class Tester { public static void main (String[] args) { intx-5; Integer xl=x; Integer x2=x; int x3=new Integer(5); system..ut.print(x1.equals(x)); system..ut.print(xl==x); system..ut.print(x2.equals(xl)); system..ut.print(x2==xl); system..ut.print(x2==x3); system..ut.print(x2.equals(x3)); } } 结果为:()A 编译失败B falsefalsetruetruetruetrueC truetruetruetruetruetrueD falsefalsetruetruetruefalseE truefalsetruefalsefalsetrueF 运行时异常被抛出
单选题如果x1,x2,…,x9是正整数,且x1<x2<…<x9,x1+x2+…+x8+x9=250,则x9的最小值为( )。A 29B 30C 31D 32
单选题设(d/dx)f(x)=g(x),h(x)=x2,则(d/dx)f[h(x)]等于:()A g(x2)B 2xg(x)C x2g(x2)D 2xg(x2)
填空题设L为椭圆x2/4+y2/9=1,其周长记为l,则∮L(9x2+4y2-3x)ds=____。
单选题If x is a positive integer and (x-6)2 = 9, then x2 = ______.A 3B 9C 16D 36E 49
填空题If t is a positive integer, and 18t is the cube of an integer, then what is the least possible value of t ?____