How many numbers greater than 100 and less than 10000 may be formed using the digits 2, 3, 4 and 5 if each digit may be used more than once? 答案 f(x)=a(x-1)^2-a+3-bx=1时有最小值f(1)=-a+3-b=2x=3时有最大值f(3)=9a-6a+3-b=5得a=3/4, b=1/4 相关推荐 1How ...
22.How many three-digit numbers greater than 900 are there that satisfy thefollowing conditions?The sum of the digits is 14.The digits are all different.The tens digit is an odd number.(A)2(B)3(C)4(D)5(E)622.How many three-digit numbers greater than 900 are there that satisfy the...
How many numbers greater than 1 and less than 500 are multiples of 2 but not multiple at 5( ).A.50B.200C.249D.250 答案 BHow many numbers between 1 and 500 are multiple of 2 but not5? there are 249 even numbers, but remove the 49 multiple of 10.大于1且小于500的、是2的倍数但...
Many students find it harder to study when they are at university or college than when they were at school. Why is this? What can be done to solve the problem? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words....
In forming a four-digit number, 0 cannot be used as the first digit, so only five out of the six possible digits can be used to fill the first decimal position of the number. Since the same digit cannot be used more than once, any of the five remaining digits can be used to fill...
Answer to: How many numbers greater than 1000 can be formed with the digits 3, 4, 6, 8, 9 if a digit cannot occur more than once in a number? By...
For how many one-digit whole numbers greater than 0 is the product of the whole number and all its factors a two-digit number?( )A.0B.2C.3D.4 答案 C相关推荐 1For how many one-digit whole numbers greater than 0 is the product of the whole number and all its factors a two-digit...
If the average (arithmetic mean) of four different numbers is 30, how many of the numbers are greater than 30? (1) None of the four numbers is greater than 60. (2) Twoof the four numbers are 9 and 10, respectively. 选项:
“I have also seen many people adopt side businesses to generate extra income, preferably something you enjoy such as photography, baking, or even leading yoga classes,” says Clint McCalla, certified financial planner at LourdMurray. “There are also sometimes opportunities for individuals to incre...
题目 How many two-digit numbers with their tens digitgreater than their units digit, have the sum of theirdigits equal to twice their difference? 相关知识点: 试题来源: 解析Aroat6ensplue.B→NO_at an_1I_1PL_1+egndAB=2XieCance=(B) ...