论文部分内容阅读
一、选择题 1.任意调动五位数12345各数位上的数字位置,所得五位数中质数的个数是( )。 (A)6 (B)4 (C)2 (D)10 2.一次函数y=x/2+k的图象与x轴、y轴的交点是A、B,如果△AOB(O是坐标原点)有面积S≤1,那么k的范围是( )。
First, multiple-choice questions 1. Arbitrary mobilization of the digits on the five-digit 12345 digits, the number of prime numbers in the resulting five digits is (). (A)6 (B)4 (C)2 (D)10 2. The intersection of the image of the primary function y=x/2 +k with the x-axis and y-axis is A, B, if △AOB (O is the coordinate The origin) has an area of S ≤ 1, then the range of k is ().