更多“单选题If a and b are positive integers such that (a-4)(b-5) = 0, what is the least possible value of a + b?A 5B 6C 8D 10E 11”相关问题
  • 第1题:

    双机架角多野技术全身共()个照射野?

    • A、4
    • B、6
    • C、8
    • D、10
    • E、12

    正确答案:E

  • 第2题:

    如果母乳营养丰富,可以供应()个月婴儿生长发育所必需的各种营养素。

    • A、0~5
    • B、0~6
    • C、0~8
    • D、0~10

    正确答案:B

  • 第3题:

    小儿腕骨骨化中心出全的数目是()

    • A、4
    • B、6
    • C、8
    • D、10
    • E、12

    正确答案:D

  • 第4题:

    测量报告中的RXQUAL共有()个等级

    • A、4
    • B、6
    • C、8
    • D、10
    • E、12

    正确答案:C

  • 第5题:

    单位卡最多可以申请()张。

    • A、5
    • B、6
    • C、8
    • D、10

    正确答案:B

  • 第6题:

    单选题
    Let Ω p be defined as p2/3-p for all positive integers, p. If Ωn = s, and s is a positive integer, which of the following is a possible value for s?
    A

    1

    B

    3

    C

    5

    D

    6

    E

    8


    正确答案: A
    解析:
    根据题干Ωn =n2 /3-n=s. n为正整数,且s为正整数;根据函数可知只有当n是3的倍数时,s才能为整数,否则如果n2 /3不是整数,s也不是整数。现在可以从符合条件的n的最小值3代入到函数中。当n=3时,n2 /3-n =32 /3-3 = 3-3 = 0 = s;当n=6时,n2 /3-n = 62 /3-6 = 12-6 = 6 = s。所以故选D。

  • 第7题:

    问答题
    If 4 percent of (p + q) is 8 and p is a positive integer, what is the greatest possible value of q ?

    正确答案: 199
    解析:
    这是一道数学题,(p + q)的4%是8,因此p+q=200,设p=1,1是最小的正整数,则可知q的最大值是199。

  • 第8题:

    单选题
    If the sum of 4 consecutive positive integers is w, in terms of w, which of the following represents the sum of the next 4 consecutive positive integers?
    A

    w2+16

    B

    w+16

    C

    4w+16

    D

    4w+4

    E

    w+4


    正确答案: C
    解析:
    Let x, x+1, x+2, x+3, represent the 4 consecutive integers. Then, x+x+1+x+2+x+3=w or 4x+6=w. The next 4 consecutive positive integers will be:x+4, x+5, x+6, x+7. Their sum will be:4x+22=4x+6+16=w+16.

  • 第9题:

    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

    -1/2

    B

    -1/3

    C

    1/3

    D

    1/2

    E

    2


    正确答案: D
    解析:
    (m|2m)=(m-2m)/(m+2m)=-1/3。

  • 第10题:

    单选题
    What is the least possible value of (x+1)2 if -2≤x≤3?
    A

    -2

    B

    3

    C

    -1

    D

    0

    E

    1


    正确答案: E
    解析:
    Since (x+1) 2 is the square of a number, the least possible square of a real number must be 0.

  • 第11题:

    单选题
    How many different positive integers are factors of 342?
    A

    9

    B

    11

    C

    12

    D

    20

    E

    22


    正确答案: E
    解析:
    342=1×342=2×171=3×114=6×57=9×38=18×19,故本题选C项。

  • 第12题:

    单选题
    x, y, and z are positive integers. Which of the following lists all the possible ways for x + y + z to be an odd number?I. One of the numbers is odd.II. Two of the numbers are odd.III. Three of the numbers are odd.
    A

    I

    B

    I and II

    C

    I and III

    D

    II and III


    正确答案: C
    解析:
    I. One of the numbers is odd. Let x be odd. Let y and z be even. y + z is even. An even plus an odd is odd, so x + y + z is odd.

  • 第13题:

    当电气配管为暗配时,弯曲半径不应小于管子外径的()倍,当埋设于地下或混凝土内时,其弯曲半径不应小于管子外径的()倍。

    • A、5
    • B、6
    • C、8
    • D、10
    • E、12

    正确答案:B,D

  • 第14题:

    热原检查中,静脉滴注可按人体剂量(mL/kg)的几倍量计,应符合规定。()  

    • A、 3~5
    • B、 4~6
    • C、 3~8
    • D、 3~10
    • E、 5~10

    正确答案:D

  • 第15题:

    成人肱骨干骨折固定时间为()周。

    • A、3~5
    • B、4~6
    • C、6~8
    • D、8~10
    • E、10~12

    正确答案:C

  • 第16题:

    列车入库速度()公里/小时。

    • A、5
    • B、6
    • C、8
    • D、10

    正确答案:A

  • 第17题:

    单选题
    al, a2, a3, a4, as, …., anIn the sequence of positive integers above, al = a2 = 1, a3 = 2, a4 = 3, and as = 5. If each term after the second is obtained by adding the two terms that come before it and if an = 55, what is the value of n?
    A

    12

    B

    10

    C

    9

    D

    8

    E

    5


    正确答案: D
    解析:
    Following the given rule for obtaining terms, write the terms of the sequence up to and including 55: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 Since 10 numbers are listed, n = 10.

  • 第18题:

    单选题
    How many positive integers less than 70 are equal to the product of a positive multiple of 5 and an even number?
    A

    4

    B

    6

    C

    9

    D

    10

    E

    11


    正确答案: E
    解析:
    All even multiples of 5 must be multiples of 10. So the multiples of 10 between 0 and 70 are 10, 20, 30, 40, 50 and 60. That’s 6 altogether.

  • 第19题:

    单选题
    热原检查中,静脉滴注可按人体剂量(mL/kg)的几倍量计,应符合规定。()
    A

     3~5

    B

     4~6

    C

     3~8

    D

     3~10

    E

     5~10


    正确答案: E
    解析: 暂无解析

  • 第20题:

    问答题
    If w+x+y=42, what is the value of wxy?  (1) x and y are consecutive odd integers  (2) w=2x

    正确答案: C
    解析:
    将两个条件综合可知,wxy=2178,故本题选C项。

  • 第21题:

    填空题
    If a and b are distinct integers such that ab<1 and b≠0, what is the greatest possible value of a/b?____

    正确答案: 0
    解析:
    因为a和b是不同的整数,ab<1,由此可知a和b的乘积要么为负,要么为0,所以a/b的最大值为0。

  • 第22题:

    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 ?____

    正确答案: 12
    解析:
    因为13=1, 23 =8, 33=27, 43 =64, 53=125这几项等不能被18整除,而第六项63=216能被18整除因为216= 18×12,所以t=12。

  • 第23题:

    单选题
    F0值是验证灭菌可靠性的重要参数,我国《GMP》规定其值为()
    A

    ≥4

    B

    ≥6

    C

    ≥8

    D

    ≥10

    E

    ≥12


    正确答案: A
    解析: 暂无解析