Li Bai walked on the street with nothing to do. He picked up a pot and went to buy wine. When he met the shop, he doubled it. When he saw the flower, he drank a bucket (the bucket was an ancient vessel). When the shop and Hua finished drinking the wine in the pot, he asked how many buckets there were in the pot?

Suppose the original wine x Dou, he meets the shop three times and sees flowers three times at the same time. After the first meeting, the wine is 2x-1; after the second meeting, the wine is 2 (2x-1) - 1; after the third meeting, the wine is 2 [2 (2x-1) - 1] - 1 = 0; solving this equation, we get x = 78 (Dou). A: how much wine is there in the wine pot

First general score and then compare the size: 1 / 3 and 4 / 9, 1 / 5 and 3 / 8, 5 / 6 and 8 / 9

First, find out the least common multiple of two fractions
The least common multiple of 1 / 3 and 4 / 9 is 9, and the general division is 1 / 3 = 3 / 9 3 / 9

4 / 15, 4 / 9, 4 / 3, 1 / 15, 11 / 9, 4 / 15

4 / 15 + 4 / 9 + 1 / 3
=12 out of 45 + 20 out of 45 + 15 out of 45
=45 (12 + 20 + 15)
=47 out of 45
=1 and 2 / 45
1 and 11 / 15-4 / 9
=1 + 11 / 15-4 / 9
=33 of 1 + 45-20 of 45
=1 + 13 / 45
=1 and 13 / 45

No matter where the value of K goes, the image of quadratic function y = x ^ 2 + (2-k) x + K always passes through the point___________

3
It has nothing to do with K value
Rearrange becomes: x ^ 2 + 2x + (- x + 1) k
Let (- x + 1) = 0 be independent of K~
X = 1, bring in the original function 1 + 2 = 3~
There's something wrong with wood

For a natural number, the sum of the numbers in each digit is 17, and the numbers in each digit are different. What is the minimum number that meets the conditions? What is the maximum number?

17 = 8 + 9, so the minimum is 89; 17 = 0 + 1 + 2 + 3 + 4 + 7, so the maximum is 743210

Simplified evaluation: A / A + 3-6 / A & # 178; - 9 + 2 / A-3, where a = - 6
The addition and subtraction of fractions

After 6 / (a ^ 2-9) can be changed into 1 / (A-3) - 1 / (a + 3), it is a simple problem of addition and subtraction
It's very simple

How to write 28 times 159 minus 28 times 59 according to simple calculation

28*159-28*59=28*（159-59）=28*100=2800.

It is known that α and β are two roots of AX + BX + C = 0, then CX BX + C factorization is

It's very simple. First, according to the relationship between root and coefficient, α + β = - B / A, α β = C / A. then, B = - A (α + β) C = a α β, and then substitute the substitution value of B and C into CX BX + C to get a (α β x + (α + β) x + α β), and then cross phase multiplication decomposition factor to get a (x + α) (x + β). Do you understand? Don't understand me, I'll tell you about it. Ha ~ written by Wang Lei

One hundredth of X is x minus thirty seventh
Find the value of X

De denominator 100 (X-7) = 30x
Remove bracket 100x-700 = 30x
Shift 100x-30x = 700
Merge congeners 70X = 700
Coefficient 1 x = 10
X = 10 is the root of the original equation

The surface area of a cube is 54 square centimeters. How many square centimeters is the surface area of a cuboid made up of three such cubes?

There are six faces in a cube, and the area of each face is 54 / 6 = 9cm & # 178;
The surface area of the three cubes is 54 * 3 = 162cm & # 178;
Four faces are missing
That is, the surface area is 162-4 * 9 = 162-36 = 126cm & # 178;