40 = () + () = () + () = () + () can only fill in prime numbers! 40 = () + () = () + () = () + () prime number

40 = () + () = () + () = () + () can only fill in prime numbers! 40 = () + () = () + () = () + () prime number

40=(3)+(37)=(11)+(29)=(17)+(23)

X-2 power of function y = a + log (x-1) + 1

(2,2) requires a ^ (X-2) to be a constant, only X-2 = 0

There are two matchboxes on the table of each group. Now we need to package these two matchboxes. Please design a packaging scheme for them,
Tell me why you pack it like this

Overlap the two sides with the largest area so that the wrapping paper is used least

ABC × d = bacd, how much is each equal to?
This is the question that the teacher gave us. As a result, she didn't say it. I went to ask the teacher. The teacher was probably in a bad mood and very angry. She didn't tell me

a=25 b=1 c=9 d=5
There is no solution below 10, and the one above is just a piece of cake

The upper base of a trapezoid is 8 cm. If the lower base is extended by 3 cm, it will become a parallelogram, and the area will increase by 24 square cm
Find the area of the original trapezoid_

The top of trapezoid is 8 cm, and the bottom will become a parallelogram if it is extended for 3 cm. The original bottom is 5 cm long
The area will be increased by 24 square centimeters, and the height will be 24 * 2 / 3 = 16cm
The area of the original trapezoid is (5 + 8) * 16 / 2 = 104 square centimeters

Triangle ABC is similar to triangle a ` B ` C ', and BC = B ` C' = 3:2. If the perimeter of triangle ABC is 24 and the area is 30, what is the perimeter area of triangle a ` B ` C '

Triangle ABC similar triangle a ` B ` C`
——》Perimeter L / L '= BC / b'c' = 3 / 2,
——》L'=L/(3/2)=24/(3/2)=16,
——》Area s / s' = (BC / b'c ') ^ 2 = (3 / 2) ^ 2 = 9 / 4,
——》S'=S/(9/4)=30/(9/4)=40/3.

Imagine future composition

Which compatriot has the answer of Tianfu mathematics issue 34, Grade 7 Volume 2, 2010?
As long as the complete square formula, integral division, this chapter of knowledge integration and problem-solving guidance.

I hope you can do it yourself. Don't think about the answer. Think about it for yourself

There is a rectangular flower bed 40 meters long and 30 meters wide in the school. Please draw the plan of this flower bed with a scale of 1:1000

Hello, sister Qionghua
The flower bed plan is a rectangle
Long drawing: 40 × 1 / 1000 = 0.04 (m) = 4 (CM)
Width: 30 × 1 / 1000 = 0.03 (m) = 3 (CM)

Xiao Zhao went to the store to buy exercise books. When he came back, he said to his classmates, "the owner told me that if he bought more, he would give me a 20% discount, and I bought 20 copies. As a result, it was 1.6 yuan cheaper. How much was the price of each copy?"

Suppose the original price of each book is x yuan
20x-20*0.8x=1.6
4x=1.6
x=0.4
The original price is 0.4 yuan per copy