Li Hua read a story book. On the first day, he read 15% of the whole book. On the second day, he read 25 pages, leaving 60% of the whole book blank. How many pages does this story book have? (please list the ordinary formula, not the equation, etc.)

Li Hua read a story book. On the first day, he read 15% of the whole book. On the second day, he read 25 pages, leaving 60% of the whole book blank. How many pages does this story book have? (please list the ordinary formula, not the equation, etc.)

I read 15% of the whole book on the first day, 25 pages on the second day, and 60% of the whole book was not read
So the percentage of the next day is: 1-15% - 60% = 25%
I read 25 pages the next day and 25% of the whole book the next day, so the number of pages is: 25 / 25% = 100 pages

Li Hua read a story book. On the first day, he read 15% of the whole book. On the second day, he read 25 pages. What's more, 60% of the whole book didn't read the story
page

First, calculate the corresponding score of the next day: 1-25% - 60% = 25%
Find the total number of pages again: 25 △ 25% = 100 (pages)
You can solve it yourself

The reciprocal of a number is 35. What's 12?

If the reciprocal of a number is 35, then the number is 1 / 35 = 53, 53 × 12 = 56

Given x-4y = 0, z = 5x (x is not equal to 0), find the value of the algebraic formula x-14y + 3Z / x + y + Z
emergency

x=4y
z=5x=20y
（x-14y+3z）/（x+y+z)
=(4y-14y+20y)/(4y+y+20y)
=10y/25y
=2/5
That's all

Given that a + 1 / 2 of a = 7, then 1 / 2 of a + 1 / 2 of a =?

If the square of (1 / 2 of a + 1 / 2 of a) is a + 1 / 2 of a = 7 + 2 = 9, then 1 / 2 of a + 1 / 2 of a = 3

If the value of fraction x + X-2 / x-x is 0, then the value of X is?

If the numerator = 0 and the denominator ≠ 0, then:
①、x²＋x－2=0
②、x²－x≠0
From (1) we can get: X1 = 1 or x2 = - 2
From 2 we can get: X ≠ 0 or X ≠ 1
Ψ x can only be = - 2

If the vertex of the parabola y = ax & # 178; - 4x + C is (1,2), then a = what, C = what

y=ax²－4x＋c=a(x²-﹙4/a﹚x)+c=a(x²-﹙4/a﹚x+﹙2/a﹚²-﹙2/a﹚²)+c=a(x-2/a)²+c-4/a
∵ vertex is (1,2), ∵ 2 / a = 1, C-4 / a = 2
The solution is a = 2, C = 4

The zeros of the function f (x) = 2x − 3x must be in the interval ()
A. （1，2）B. （2，3）C. （3，4）D. （4，5）

Because the function f (x) = 2x − 3x is a continuous function in the domain of definition, f (1) = - 1 ＜ 0, f (2) = 52 ＞ 0, so f (1) · f (2) ＜ 0, so the zero point of function f (x) = 2x − 3x must be in the interval (1,2), so select a

(x ^ 2-3x) / (x ^ 2-6x + 9) reduction

The original formula = x (x-3) / (x-3) &;
=x/(x-3)

Help me solve quadratic equation of one variable @! You know, it's very simple~~~~
x^+4x=36500
x^2+4x=36500
Square of X + 4x = 36500

x^2+4x=36500
x^2+4x-36500=0
x1=-2+(4+36500)^0.5=-2+(36504)^0.5=189.0602
x2=-2-(4+36500)^0.5=-2-(36504)^0.5=-193.0602