What kind of books do you like

What kind of books do you like

What kind of books do you like?
Come on for the final exam/

I like books about English very much
So I want to be a member of the English club

I like books about English very much.
So I want to be a member of the English club.

There are 47 pieces of RMB 2.5 yuan and 10 yuan, totaling 223 yuan. Among them, there are as many pieces of RMB 2.5 yuan and 5 yuan. How many pieces of RMB 10 yuan?

X+Y+Z=47
2X+5y+10z=223
x=y
The whole formula is like this. It's very simple. It's not easy to write on the computer. You can calculate it on the paper. I'll set X for 2 yuan, y for 5 yuan, and Z for 10 yuan. Because x = y, we can solve a very simple one variable quadratic equation system by replacing y with X
X+X+Z=47
2X + 5x + 10z = 223, let's solve it by ourselves

Find the rule and fill in 1,2,3,5,6,7,9,10, (), ()

11,13

Let f (x) be defined as R. for any real number x, y, f (x + y) = f (x) · f (y), and when x > 0, 0
T. T I'm sure I have the right number I'm so annoyed with this question There must have been a mistake

This is the problem of abstract function, the general study of abstract function can consider the assignment method
The answers are as follows:
We can substitute x = 0, y = 1 to get: F (1) = f (0) × f (1), and get: F (0) = 1 or F (1) = 0, because when x > 0, 0

Finding integral ∫ ((x + 1) / sqrt (x ^ 2 + X + 1)) DX
∫((x+1)/sqrt(x^2+x+1))dx
Sqrt () means square root
Provide solution steps or ideas

(x + 1 / 2) / (x ^ 2 + X + 1 + 2 + 2 + 2 + 1 / 2) and the DX = 1 / 2 8747 (x + 2 + X + 1) and (x ^ 2 + X + 2 + X + 1) d (x + 2 + x + 2 + X + 2 + X + 1) d (x + 2 + 2 + 2 + X + 2 + X + 2 + X + 2 + X + 2 + X + 2 + X + 2 + X + 2 + 2 + X + 2 + 2 + 2 + X + 2 + x + 2 + 2 + 2 + X + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3 / 4) and (x + 1 / 1 / 1 / 2) d (x + 1 (x + 1 / 1 / 1 / 2) = ln [ln [x [x [x + 1 [x + 1 / 2 [x + 1 / 2 [x + 1 / 2] 1 / 2 +

The regularity is 1.4, 9, 19, 39, 79, () 2.1, 4, 6, 9, 11, 14, (), () 3.1, 3, 7, 15, 31, (), ()

1.4、9、19、39、79、（159 ）
2.1、4、6、9、11、14、（16 ）、（19 )
3.1、3、7、15、31、（63 ）、（127 ）

There is a fraction 7 of a (a is a non-zero natural number). When a (), 7 of a is a true fraction; when a (), 7 of a is a false fraction

There is a fraction 7 of a (a is a non-zero natural number). When a is greater than 7, 7 of a is a true fraction; when a is less than or equal to 7, 7 of a is a false fraction

Numbers like 123 are called natural numbers. Natural numbers with a larger range are positive numbers of integers. What are the numbers with a larger range? Are there any numbers with a larger range?

Real numbers, the largest is the plural

Find the law: 1.5.11.10.21.15.31 · ()
emergency

1·5·11·10·21·15·31·(20)·(41)
Singular 1,11,21,31,41
Even number 5,10,15,20,25