dim a,b as interger 其中 a,b定义都是整数吗

wuyuwuyuwu2022-10-04 11:39:541条回答

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求英语翻译For how many positive two-digit interger is the ones di 求英语翻译For how many positive two-digit interger is the ones digit greater than twice the tens digit? PUNK喵喵1年前2: faye5201314 共回答了20个问题 | 采纳率90%

有多少正整数是两位数的数字大于两倍的十位数?

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提问几道gre数学题都是绿皮上的1.A certain interger n is a multiple of both 提问几道gre数学题 都是绿皮上的 1.A certain interger n is a multiple of both 5 and 9.which of the following must be true? A.n is an odd integer B.n is equal to 45 C.n is a multiple of 15 A选项为啥不对? 2.How many positive integers less than 20 are equal to the sum of a positive multiple of 3 and a positive multiple of 答案是seven.这题怎做啊,除了一个数一个数代还有啥方法? 3.A buzzer sounds every 15 minutes.if the buzzer sounded at 12:40,which of the following could be a time at which the buzzer sounded? A.4:05 B.5:30 C6:45 D.7:15 E:8:10 4.If n is an odd integer,then n^2-1 must be A.a prime number B.an odd integer C.divisible by 8 D.a multiple of 2^n E.a positive integer 就想问D如何排除? 左边少一少1年前1: jinhuaxin 共回答了17个问题 | 采纳率88.2%

这个数字是5和9的倍数,也就是说,一定是45的倍数,但不一定是奇数,比如90就满足条件.但是,只要是45的倍数,就一定是15的倍数.
3的倍数和4的倍数的和,还要小于20,只能逐个尝试,我试出来8个.
7=3+4
10=3*2+4
11=3+4*2
13=3*3+4
14=3*2+4*2
16=3*4+4
17=3*3+4*2
19=3*5+4
这个题恐怕要逐个验证一下,就是看看那段时间是否会响.
n是奇数,写作2m+1,则n^2-1=4m(m+1)
m和m+1是连续数,乘积必为偶数,所以选C.如果想去掉D,就找个例外,比如n=5,n^2-1=24,就否掉了.

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