Xiaohua likes to watch "100000 whys". This week, he planned to read 80 pages, but actually read 110 pages. How many more pages did he actually read than he planned?

Actual number of pages
110-80=30
How many percent more pages are actually read than planned
30÷80=0.375=37.5%
Comprehensive formulation
(110-80)/80*100%=37.5%

Xiao Gang tore off the three calendars of February. The sum of every two dates said 27.28.29 respectively. What are the three dates?
The tip is: consider the sum of three numbers
=Quick reply
And I don't want to say anything else

Let x, y and Z be three numbers respectively
There are three ways to add three numbers in a group of two
And:
x+y=27 （1）
x+z=28 （2）
z+y=29 （3）
Substituting the deformation x = 27-y of formula (1) into (2), we get: Z-Y = 1 (4)
The results of (3) and (4) are as follows
z=15
y=14
Substituting (1)
x=13
And the three dates are 13, 14 and 15 respectively
This problem is very simple. Is it a cubic equation

Xiao Ming and Xiao Gang each take a calendar to do a date guessing game. Xiao Ming finds that the sum of three numbers in a vertical column of his calendar is 69, while Xiao Gang's calendar is 69

Original title: Xiao Ming and Xiao Gang each take a calendar to do a date guessing game. Xiao Ming finds that the maximum sum of three numbers in a vertical column on his calendar is 69, while the maximum sum of three numbers in a vertical column on Xiao Gang's calendar is 72. Is this possible? Tell me the reason!
Because it is based on the vertical column, let's set the first X, the second X + 7, and the third x + 14
From the calendar, the first number is 13, the second 13 + 7 = 20, the third 13 + 14 = 27, the sum is exactly 72, so it is reasonable. If you have any questions, please Baidu Hi~
I hope I can help you~

The general term formula of sequence {an} is an = log2 (n + 1) - log2 (n + 2). Let the sum of the first n terms of {an} be Sn, then SN

Solution 2 / 3 * 3 / 4 * 4 / 5 *. * (n + 1) / (n + 2) = 2 / (n + 2)
Sn=log2(2/3*3/4*4/5*.*（n+1)/(n+2)=2/(n+2))=log2（2/(n+2)）

1 / sqrt (x * x + 1) for indefinite integral

∫1/√（x*x+1）dx=ln（x+√（x*x+1）））+C
∫1/√（x*x-1）dx=ln（x+√（x*x-1）））+C
These two special integrals must be remembered

Fill in 0, 1, 4, 15, 56 and ()

The law begins with the third number
The third is the second multiplied by 4 minus the first, i.e. 1 * 4-0 = 4
The fourth is the third multiplied by 4 minus the second, that is, 4 * 4-1 = 15
Similarly, the sixth is the fifth multiplied by 4 minus the fourth, that is 56 * 4-15 = 209

Any nonzero natural number can be regarded as a false fraction whose denominator is 1

That's right! O (∩)_ ∩)O~

What is the largest negative integer? What is the smallest positive integer? What is the smallest natural number?

-1
one
0

3, - 7,11, - 15,19, - 23. What is the nth number
Isn't that right

[-1）^（n-1）][3+4(n-1)]
The (n-1) power of (- 1), multiplied by the sum of 3 and 4 (n-1)

A natural number, which can be divided by 3 and 25, and has 10 divisors______ ．

Because this number can be divided by 3 and 25, and has 10 divisors, so this number is a multiple of 75. Its divisors should be 1, 3, 5, 15, 25, 75, 125, 375, 625, 1875, a total of 10. A: this natural number is 1875

Xiaohua likes to watch "100000 whys". This week, he planned to read 80 pages, but actually read 110 pages. How many more pages did he actually read than he planned?