求解几道题！！谢谢了！！

yexianda

For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
a.    f(x)=x2 b. f(x)=x+1 c. f(x)=根号x d. f(x)=2/x e. f(x)=-3x

According to the directions on a can of frozen orange concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
25

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n?
Answer:11

 
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
34
What is the sum of the different positive prime factors of 550?
15
For all positive integers m, m=3m when m is odd and m=1/2m when m is even. Which of the following is equivalent to 9x5?
27

OpheliaMeow

感谢热心网友 解疑 对我帮助很大 顶！！！！

yexianda

不知道该说什么了，， 谢谢 !!真的很感谢  我后天杀G 希望能拿到满意的分数！！谢谢你的祝福

citrus橘子

For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
a.    f(x)=x2 b. f(x)=x+1 c. f(x)=根号x d. f(x)=2/x e. f(x)=-3x

According to the directions on a can of frozen orange concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
25

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n?
Answer:11

 
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
34
What is the sum of the different positive prime factors of 550?
15
For all positive integers m, m=3m when m is odd and m=1/2m when m is even. Which of the following is equivalent to 9x5?
27

-- by 会员 yexianda (2013/1/13 18:16:48)

最后一题 觉得是答案错了 550=2*5*5*11  2+5+11=18

-- by 会员 citrus橘子 (2013/1/13 19:21:28)

是倒数第二题。。。

citrus橘子

For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
a.    f(x)=x2 b. f(x)=x+1 c. f(x)=根号x d. f(x)=2/x e. f(x)=-3x

According to the directions on a can of frozen orange concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
25

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n?
Answer:11

 
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
34
What is the sum of the different positive prime factors of 550?
15
For all positive integers m, m=3m when m is odd and m=1/2m when m is even. Which of the following is equivalent to 9x5?
27

-- by 会员 yexianda (2013/1/13 18:16:48)

最后强烈建议你贴之前，先到google上搜一下，很多题都有答案 省时省力呢~~机经版的孩子们大都纠结于备考，看到这么一大篇副题 看完是需要勇气的吧 我昨天就看到你贴了。。但是太多。。就不太愿意打字了。今天又看你贴了一次，才觉得应该把这些告诉你。
祝你杀G成功！

citrus橘子

For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
a.    f(x)=x2 b. f(x)=x+1 c. f(x)=根号x d. f(x)=2/x e. f(x)=-3x

According to the directions on a can of frozen orange concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
25

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n?
Answer:11

 
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
34
What is the sum of the different positive prime factors of 550?
15
For all positive integers m, m=3m when m is odd and m=1/2m when m is even. Which of the following is equivalent to 9x5?
27

-- by 会员 yexianda (2013/1/13 18:16:48)

最后一题 觉得是答案错了 550=2*5*5*11  2+5+11=18

citrus橘子

For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
a.    f(x)=x2 b. f(x)=x+1 c. f(x)=根号x d. f(x)=2/x e. f(x)=-3x

According to the directions on a can of frozen orange concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
25

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n?
Answer:11

 
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
34
What is the sum of the different positive prime factors of 550?
15
For all positive integers m, m=3m when m is odd and m=1/2m when m is even. Which of the following is equivalent to 9x5?
27

-- by 会员 yexianda (2013/1/13 18:16:48)

最后一题，你把题粘错了。。。少个*
For all positive integers m, m* = 3m when m is odd and m* = m/2 when m is even. Which of the foll is equivalent to (9*) x (6*)
1. 81*
2. 54*
3. 36*
4. 27*
5. 18*
Answer : 27*
题意你肯定懂，m是奇数的话，m* = 3m，m是偶数的话等于m/2，你算的肯定是81 但是要知道you need to apply the definition to the answer choices, too  27*= 3 x 27 = 81 = 9*x6*

citrus橘子

For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
a.    f(x)=x2 b. f(x)=x+1 c. f(x)=根号x d. f(x)=2/x e. f(x)=-3x

According to the directions on a can of frozen orange concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
25

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n?
Answer:11

 
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
34
What is the sum of the different positive prime factors of 550?
15
For all positive integers m, m=3m when m is odd and m=1/2m when m is even. Which of the following is equivalent to 9x5?
27

-- by 会员 yexianda (2013/1/13 18:16:48)

第四题见附件

citrus橘子

第三题：先把990分解质因数 990=3*3*11*2*5
从1乘到n的乘积若要是990的multiple 则必须包含上述所有因子 可以试着想一下从1乘到10，乘数中已经包含2、5、2个3，但还却11，那就再乘上个11好了 正好就是从1乘到11

citrus橘子

第一题：把x=a x=b x=a+b 分别代入下面几个选项的函数中 看是否是 f(a+b)=f(a)+f(b)
第二题：1 can of concentrate is to be mixed with 3 cans of water to make orange juice 的意思是1罐浓缩汁和3罐睡可以混合成果汁，也就是说浓缩汁比水=1比3
设需要x罐12盎司的浓缩汁 则：12x+3*12x=200*6  解之即可