My imagination composition for tomorrow

My imagination composition for tomorrow

Tomorrow is an unknown. I want to lay a good foundation for my future. I wrote a poem specially, and please give me more advice. If tomorrow I am a scientist, I will invent many things to benefit mankind. If tomorrow I am a rich man, I will travel everywhere, and I want to go to Beijing to watch the Olympic Games. If tomorrow I am a writer

All the answers to Tianfu mathematics in Grade Seven

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Title Title

The scale of a plane map is 1:300, which means that the actual distance is () times of the distance on the map, and the distance on the map is () times of the actual distance

It means that the actual distance is 300 times of the distance on the graph, and the distance on the graph is one of 300 times of the actual distance

Linear equation of one variable in contact book
To solve the equation: 3x-3 = 2x-3, Xiao Peng solved it like this. If you add 3 to both sides of the equation, you get 3x = 2x. If you divide both sides of the equation by X, you get 3 = 2, so there is no solution to the secondary equation
Is Xiao Peng's explanation correct? If he gives the reason correctly, if he doesn't point out the mistake, he will correct it

A: Xiao Peng's solution is incorrect. For the equation 3x = 2x, we can't divide X by both sides at the same time, because we can't guarantee that x divided by both sides is not zero
The correct solution is: 3x-2x = 0, and x = 0

There are four people who cross the bridge at night. The bridge can only walk two people at a time, and they need to use a flashlight. There is only one flashlight. The speed of the four people is: a 1 minute
There are four people who cross the bridge at night. The bridge can only walk two people at a time, and they have to use a flashlight. So one person has to come back, and there is only one flashlight. The speed of the four people is: a 1 minute, B 2 minutes, C 4 minutes, D 6 minutes. How can they cross the bridge in 13 minutes?

Two minutes first
A comes back for one minute
Bingding leaves for six minutes
B will be back for two minutes
Let's go for two minutes together
Total 2 + 1 + 6 + 2 + 2 = 13 minutes

Uncle Wang driving on a straight road, the steering wheel movement is translation or rotation phenomenon

The steering wheel moves along with the car and rotates on its own axis

Given the point a (1,2) B (2,3) C (- 2,5), then the vector AB * vector AC =?

Vector AB = (1,1)
Vector AC = (- 3,3)
If you do the inner product, it's equal to 0
You don't need to use the * sign any more, just use ·

O is the intersection of the angular bisectors of ∠ ABC, ∠ ABC, OD ‖ AB, intersecting AB at D, OE ‖ AC, intersecting BC at E. if BC = 10cm, then the perimeter of △ DOE is?

There should be two mistakes in the title: O is ∠ ABC, the intersection of angle bisector of ∠ ACB, OD ‖ AB, intersection of BC with D ∵ Bo bisector ∠ ABC, CO bisector ∠ ACB ∵ ABO ∵ CBO ∵ OD ‖ ab ∵ DOB ∵ ABO ∵ DOB ∵ CBO ∵ BD = OD. Similarly, CE = OE ∵ the perimeter of DOE = od + de + OE = BD +

Find the equation of the circle passing through the point m (2, - 2) and the intersection of circle x2 + y2-6x = 0 and circle x2 + y2 = 4

Let the equation of a circle passing through the intersection of circle x2 + y2-6x = 0 and circle x2 + y2 = 4 be: x2 + y2-6x + λ (x2 + y2-4) = 0 ① By substituting the coordinates (2, - 2) of point m into formula (1), we can get λ = 1. By substituting λ = 1 into formula (1), we can get x2 + y2-3x-2 = 0. The equation of the circle is: x2 + y2-3x-2 = 0

As shown in the figure, AB parallels CD, be bisects ∠ Abe, DF bisects ∠ CDE, ∠ BFD = 55 degrees, find the degree of ∠ bed
I don't have a picture. Let's talk about it. AB is parallel to CD, with F, E in the middle, f is connected with de, and D is also connected with de. calculate the degree of ∠ bed. BF bisection ∠ Abe

Is there a problem in this sentence