F.1 Math（急！！！！！）有10點

Q.1. what is the product of all positive integers?
Ans: It is infinitive.

Q.2. Find the remainder when a positive integer with unit digit 8 is divided by 5.
Ans: It is 3.

Q.3. When an integer is divided by 6, the quotient and remainder are both 5.Find the integer.
Ans: x=5*6+5
x=35
the integer is 35

Q.4. List all the factors of 200.
Ans: They are 1,2,4,5,8,10,20,25,40,50,100,200.

Q.5. List all the prime factors of 200.
Ans: They are 2,5

Q.6. What is the greatest negative integer?
Ans: It is infinitive.

Q.7. Find the sum of all 2-digit positive even integer.
Ans: (10 + 14 ... + 98)
=(10 + 98) (45)/2
=2430

Q.8. Find an integer that is neither positive nor negative
Ans: It is 0.

1. infinitive
2. 3
3. 1,2,4,5,8,25,40,50,100,200
4. 1,2
5. - infinitive
6. (12 + 14 ... + 98)
= 12 + (44 - 1) x 2
(12 + 98) (44)/2
=2420
7. 0

2014-08-15 16:07:13 補充：
6. (10 + 14 ... + 98)
(10 + 98) (45)/2
=2430

你好
第一題我有點不明白（what is the product of all positive integers?）
第二題：
the remainder when a positive integer with unit digit 8 is divided by 5
=3
第三題：
When an integer is divided by 6， the quotient and remainder are both 5
=35
第四題：
all the factors of 200
=1,2,4,5,8,10,20,25,40,50,100,200
第五題：
all the prime factors of 200
=2,5
第六題不太明白（what is the greatest negative integer）
第七題：
the sum of all 2-digit positive even integer
=10+12+14+16+20+22+24+...+98
=54x45
=2430
第八題：
0

basic maths! u learn that from apex ?