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Application problem, formula, urgent! There are 480 extra-curricular books in the library. One eighth of the total books are lent on the first day, one twelfth more on the second day than on the first day. How many more books are lent on the second day than on the first day?
First day = 480 × 1 / 8 = 60 copies
The next day more = 60 × 1 / 12 = 5
Application of the formula
The science and technology museum opens at 9:00. Xiaohong walks from her home at 8:30 to visit the science and Technology Museum. At 8:50, she completes 5 / 7 of the whole journey
Looking for such a speed, did Xiaohong reach the goal before the science and Technology Museum opened
Let's go
8: 50-8:30 = 20 points
It's important to finish the whole journey
5 out of 7 = 28
8：30＋28＝8：58
therefore
At this rate, Xiaohong can reach the goal before the science and technology museum opens
According to the formula to add conditions to the application
There are 400 apple trees in the orchard______________________ How many pear trees are there?
1.400×（1+20%）
Conditions:__________________________
2.400×（1-20%）
Conditions:__________________________
3. Set X pear trees, X × (1 + 20%) = 400
Conditions:__________________________
4. Set X pear trees, X × (1-20%) = 400
Conditions:_________________________
1: Pear trees are 20 percent more than apple trees
2: Pear trees are 20% less than apple trees
According to the formula to the application of supplementary conditions (see the supplementary question) to give high scores!
100 hectares of corn planted in a certain farm, how many hectares of wheat planted?
(1) 100 times 1 / 4 plus 40-----------------------------------
(2) 100 times (1 + 1 / 4)---------------------------------
(3) 100 times (1 minus 1 / 4)---------------------------------
(4) 100 divided by 3 / 4-------------------------------------
(5) 100 divided by (1 + 3 / 4)---------------------------------
You know, please tell me, thank you. I can't type the symbol, so I have to use the number. Please understand that the horizontal line is the supplementary condition. I don't know how to do it. Please give me your advice
1. The area of wheat is 40 hectares more than that of corn
2. The area of planting wheat is 1 / 4 more than that of corn
3. The area of planting wheat is 1 / 4 less than that of corn
4. It is 3 / 4 of the planting area of wheat
5. 3 / 4 more than wheat
1 to 2002 natural numbers. Add a plus or minus sign between them (but make the result meaningful). Is the result odd or even?
(1) Firstly, there are 1,3,5,... 2001, (2001-1) / 2 + 1 = 1001 odd numbers, 2,4,6,... 2002, (2002-2) / 2 + 1 = 1001 even numbers, (2) odd + (or -) odd = even numbers, odd + (or -) even = odd numbers; = > the result of adding and subtracting odd numbers is odd numbers, even numbers are odd numbers
From 1 to 2011, add a plus sign and a minus sign to make the result zero
Explain
-1+2+3-4-5+6+7-8-9.-2009+2010+2011-2012
To sum up, there are 503 pairs of -, +, +, - in total
Because - 1 + 2 + 3-4 = 0 - 5 + 6 + 7-8 = 0, there are four combinations until the end
See?
Satanbaby
If n is any natural number, then any even number can be expressed as (), and any odd number can be expressed as ()
A.n+2 B.n+1 C.2n D.2n+1
Then any even number can be expressed as (c), and any odd number can be expressed as (d)
Natural number can be divided into odd number and odd number, prime number and composite number
15 is odd, composite and multiple. The factors of 5.23 are prime. 6. Natural number a, its maximum factor is also a. 7. The number of factors of number is limited within 8.25. All multiples of 6 are 12,18,24,9.2 and 3 are prime factors. 10.3,4,5 are prime factors of 60. 10.1 is the factor of all natural numbers
Yes
yes
yes
yes
yes
yes
yes
yes
wrong
yes
In natural numbers less than 20, what are odd numbers, even numbers and combined numbers
What are the numbers with a factor of 5, the greatest common factor of 30 and 54, and the least common multiple
Odd: 1,3,5,7,9,11,13,15,17,19
Even number: 2,4,6,8,10,12,14,16,18
Total number: 4,6,8,9,10,12,14,15,16,18
Numbers with factor 5: 5, 10, 15
The greatest common factor of 30 and 54 is 6 and the least common multiple is 270
Given that x is odd and √ [(X-6) / (9-x)] = √ (X-6) / √ (9-x), find the value of √ (1 + 2x + x ^ 2) + √ (3x-1)
√[(x-6)/(9-x)]=√(x-6)/√(9-x)
6≤x
RELATED INFORMATIONS
- 1. According to the formula, the supplementary conditions and the meaning of each formula are given 1、 Xiaohua has 18 storybooks. How many storybooks does Xiaohong have? 18 + 2 is () 2.18 * two thirds of the supplementary conditions are () 3.18/two thirds of the supplementary conditions are () 4.18 * (1 + two thirds) the supplementary condition is () 2、 Tell the meaning of the following expressions 1.700/780 indicates () 780 / (700 + 780) for () 3. (780-700) / 700 * 100% means ()
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