The total price of 80 Chinese books and 100 mathematics books is equal. It is known that each Chinese book costs 5 cents more than each mathematics book. What are the unit prices of Chinese books and mathematics books?

The total price of 80 Chinese books and 100 mathematics books is equal. It is known that each Chinese book costs 5 cents more than each mathematics book. What are the unit prices of Chinese books and mathematics books?

Let x score of each math book be 100x = 80 (x + 5)
100x=400+80x
20x=400
x=20
20+5=25
Unit price is 20 points and 25 points, hope to adopt, I wish you progress in learning

If you buy 80 Chinese books, you can buy 100 mathematics books. It is known that each Chinese book is 0.8 yuan more expensive than mathematics books. What are the unit prices of Chinese books and mathematics books?
Strategy of substitution

Suppose that each mathematics book costs X Yuan, then each Chinese book costs (x + 0.8) yuan
100x=80(x+0.8)
100x=80x+80×0.8
20x=64
x=3.2
x+0.8=4
Answer: 4 yuan for each Chinese book and 3.2 yuan for each math book

The problem I mentioned is that the total price of 80 Chinese books and 100 mathematics books is equal. It is known that each Chinese book is 5 jiao more expensive than each mathematics book. What are the unit prices of Chinese books and mathematics books? We should use the replacement strategy to solve the problem

Let the price of each math book be x angle
The price of each Chinese book is (x + 5) Jiao
80*（x+5）=100*x
So x = 20
That is, the unit price of Chinese books and mathematics books is 25 Jiao and 20 Jiao respectively

What is the limit of LNX when x approaches zero
How close is it

Negative infinity. Just look at the graph of its function

Simple calculation: 2 / 3 + 6 / 7-2 / 3 + 6 / 7 1 / 12 + 3 / 8 + (5 / 8 + 5 / 12)
First question to 6 / 7 second question from 1 / 12

2/3+6/7-2/3+6/7
=(2/3-2/3)+(6/7+6/7)
=0+12/7
=12/7
1/12+3/8+(5/8+5/12)
=1/12+3/8+5/8+5/12
=(1/12+5/12)+(3/8+5/8)
=1/2+1
=1.5

X & # 179; y-2x & # 178; Y & # 178; + X & # 179; who can tell me how to calculate and what the formula is,

At the same time, x ^ 2 is proposed to get x ^ 2 (xy-2y ^ 2 + x)

3 / 7 divided by () = 1 / 21

Three out of seven divided by (9) = one in twenty-one
3/7÷1/21=9

Given the point a (1,3) B (- 5,5), how to solve the equation of circle with the diameter of line ab
What if we change points a and B to a '(x1, Y1) B' (x2. Y2)?

The steps are as follows:
1) The midpoint P coordinate of AB ((x1 + x2) / 2, (Y1 + Y2) / 2), here is (- 2,4)
2) The distance D of AB: D ^ 2 = (x1-x2) ^ 2 + (y1-y2) ^ 2, where d ^ 2 = 6 ^ 2 + 2 ^ 2 = 40, so d = 2 √ 0
So radius r = D / 2 = √ 10
The equation of circle is obtained as follows: (x + 2) ^ 2 + (y-4) ^ 2 = 10

3 / 4x-3 / 5x = 9 6x + 2.4 = 11.4 2 / 5x divided by 6 / 7 = 7 / 10 (solving equation)
Come on, come on

3/4x-3/5x=9
3*5-3*4=9*20x
x=1/60
6x+2.4=11.4
6x=9
x=3/2
2 / 5x divided by 6 / 7 = 7 / 10
(2/5x) *(7/6)=7/10
7x/15=7/10
x=3/2

Given the set M = {1, x, x ^ 2}, find the value range of X

Analysis: according to the meaning of the question: 1) x ≠ 12) x & # 178; ≠ 13) x & # 178; ≠ x, the solution is x ∈ R, and X ≠ 0, X ≠ ± 1