Xiao Jun read a story book. He read 42 Pages on the first day and 43 pages on the second day. He read 17% of the whole book in two days?

Xiao Jun read a story book. He read 42 Pages on the first day and 43 pages on the second day. He read 17% of the whole book in two days?

A: there are 500 pages in this story book

Xiao Jun read a story book. On the first day, he read half of the book. On the second day, he read the remaining half. On the third day, he read the remaining half,

On the first day, I saw 1 / 2, and there was 1 / 2 left
The next day, I saw that the remaining half was 1 / 2 * 1 / 2 = 1 / 4
There's a quarter left
On the third day, I saw 1 / 2 of 1 / 4, that is, there was 1 / 8 left

Xiao Jun read a 320 page story book. On the first day, he read several pages, and on the second day, he read 64 pages. In two days, he read 60% of the book. On the first day, he read 60% of the book
What percentage of the book did you read on the first day

Set the first day of reading as X
(x+64)÷320=0.6
x=128
128÷320=40％

When x=______ 4X + 8 and 3x-10 are opposite to each other

From the meaning of the title;
4x+8+3x-10=0
7x=2
x=2/7
When x=__ 2/7__ 4X + 8 and 3x-10 are opposite to each other

The law of 1 / 3, - 2 / 6,3 / 9, - 4 / 18,5 / 36

Because the first item 1 / 3 = (- 1) ^ (1-1) * (1 / 3) * (1 / 1); (1 in 1 / 1 is set as A1), the second item - 2 / 6 = (- 1) ^ (2-1) * (1 / 3) * (1 / 2); (2 in 1 / 2 is set as A2), the third item 3 / 9 = (- 1) ^ (3-1) * (1 / 3) * (1 / (1 + 2)); (1 / (1 + 2) is set as A3), the fourth item - 4 / 18 = (- 1) ^ (4-1) *

Solving the bivariate linear equation 3x-5y = 10 2x + 3Y = - 6

Solution 1: 3x-5y = 10. (1) 2x + 3Y = - 6. (2) (1) * 3 + (2) * 5 get: 9x + 10x = 30-30 into: 19x = 0 solution: x = 0 substitute (2) get: 2 * 0 + 3Y = - 6 solution: y = - 2 solution 2: 3x-5y = 10 ①2x+3y=-6…… ② (1) 6x-10y = 20 ③ 2 × 3 is 6x + 9y = - 18 ④③...

What is the answer to 1978 × 1979 + 1979 × 1980 / 1 + 2 + 3... + 1978 + 1979 + 1978 + 1977 +... 1
I would like to know the correct answer, thank you very much

1978×1979+1979×1980/1+2+3...+1978+1979+1978+1977+...1 =1978×1979+1979×1980/（1979×1978+1979） =1979×2×1979/1979×1979 =2

What is the relationship between the quadratic function ABC?
1) How does a determine the opening direction of the function image?
(2) C is the ordinate of the intersection of the function image and the y-axis, that is, the y-axis intercept C is greater than or less than 0?
(3) The discriminant ■ = B ^ 2-4ac determines the number of solutions of the equation, that is, the number of intersections between the function image and the x-axis
(4) - B / 2a is the abscissa of the axis of symmetry of the function image
a+b+c=

The sign of a determines the absolute value of opening direction, the width of opening, the distance between symmetry axis and Y axis, and the intercept of image on Y axis

If 7111 = 0 5555 = 0 8809 = 6 8193 = 3 2172 = 0 8096 = 5 6666 = 4 4398 = 3 1111 = 0 9475 = 1
2222=0 9038=4
7662=2 3148=2
9313=1 0000=4
2889 =?

The score of 123457 is 00, 6, 9 is 18 is 2, and each group of numbers is to add up the score of this group of numbers. SO 2 in 2889 is 0, 8 is 2, but there are two notes 4, 9 is 1, so 2889 = 5. Of course, children think differently, as most netizens think, they think that children don't

Given the set a = {x is greater than or equal to 3 but less than 6}, B = {greater than 2 but less than 9}, find Cr (a) intersection B and (CRB) intersection a

∵a={x│3≤x＜6},b={x│2＜x＜9｝}
∵a∩b={x│3≤x＜6｝
∩ Cr (a ∩ b) = {x │ x ＜ 3 or X ≥ 6}
∵ CRB = {x │ x ≤ 2 or X ≥ 9}
(CRB) ∩ a = empty set