Seeking the case materials in argumentative papers On the courage to face the reality, see the reality, self-confidence, not afraid to see their own lack of that side of the material examples

For example, when I was ill, my parents took good care of me; during school, my classmates nearby formed a "special escort team" to send me to school and home; in 1993, I was in the petrochemical fuel business, which was introduced by my friends. I also have to thank God, although it made me

What unit of length is 450mm?
I have a tape measure and found that there is a scale every 450mm on it. Is this a code? If not, what should be the length unit?

It could be half a yard
Accurate point 0.5 yard = 457mm

Length unit symbol "μ", what to read

miu
The fallacy of the same sound as "fallacy"

In the parallelogram ABCD, if AC = 3, BD = 2, then (vector AB + vector DC) · (vector AC + vector BD)=

AB = DC, AC = AB + ad, BD = ad-ab, so: AC + BD = 2ad, so: (AB + DC) · (AC + BD) = 4AB · AD and: | AC | ^ 2 = (AB + AD) · (AB + AD) = | ab | ^ 2 + | ^ 2 + 2Ab · ad = 9 --- (1) | BD | ^ 2 = (ad-ab) · (ad-ab) = | ^ 2 + | ^ 2-2ab · ad = 4 ------ (2) so: (1) - (2) get: 4A

When calculating a subtraction problem, Xiao Ming wrote 5032 for 5023 mistakes, 2 for 3 mistakes on the thousands, and 8 for 5 mistakes on the tens. The difference is 2352. What is the correct difference?
Oh, my God, this question is confusing me

2352-9-1000+30=1373
A: the correct difference is 1373
If you wrongly write 5023 as 5032, the divisor will be expanded by 9, and the quotient will be expanded by 9, so you need to reduce 9;
If you write the three mistakes in the minus thousand as two, the minus will be reduced by 1000, but the quotient will be expanded by 1000, so you have to reduce 1000;
If the 5 mistakes in the 10 digits are written as 8, and the subtraction is increased by 30, the quotient will be reduced by 30, so it needs to be increased by 30

The change of acceleration, speed and other physical quantities in the process of car starting?

When starting with constant power, the acceleration gradually decreases, but the speed increases. When the traction force equals to the resistance, the speed is the maximum, and the acceleration is 0. When starting with constant acceleration, the speed increases at a constant speed, and the acceleration does not change. When the power increases to the rated power, the acceleration with reduced acceleration begins until the traction force equals to the resistance, and V is the maximum, and a equals to 0

Mathematics problem, give a train of thought to go
Let's know the obtuse isosceles triangle ABC, ab = AC, P is a point on the side of BC, PE is perpendicular to AB and PF is perpendicular to AC and F. let's explore the quantitative relationship between PE + PF and ABC. If ABC is an acute isosceles triangle and other conditions remain unchanged, is the conclusion still valid?
I want to think

This problem can be solved by using similar triangles
P at that point, make two vertical lines, can be divided into two similar triangles
Thinking from here

With the deepening of organizational reform, all units need to reduce the number of employees to give effect. In one company, there are 2 employees, 2a is more than 140, less than 420, and a is an odd number (I'm sorry for the odd number). Each person can make a profit of RMB 10000 per year. According to the evaluation, under the premise of the same conditions, each person who is laid off can create an additional RMB 101b per year However, the company needs to pay the living expenses of 40 thousand laid-off employees per year, and the number of employees in normal operation of the company should not be less than a / 2. How many employees should be laid off in order to obtain maximum economic benefits
I've worked out the subtraction function, and I'm not going to cut anyone
Don't dare to put more. If the answer is correct, 50 + points will be added

That's called an even number
Set minus x person
f(x)=(2a-x)*x*0.01b-0.4x*b
=b(-0.01x²+0.02ax-0.4)
=-0.01b(x²-2ax+40)
=-0.01b(x-a)²-0.4b+0.01a²b
When x = a, f (x) is the largest
Ask me if you don't understand

The application of derivative in function problems
F (x) = (x + 1) lnx-x + 1 to prove (x + 1) f (x) > = O

F (x) = (x + 1) LNX + (1-x) g (x) = (x + 1) f (x) = (x + 1) ^ 2lnx + (1-x ^ 2) g '(x) = 2 (x + 1) LNX + (x + 1) ^ 2 / x-2x = [2 (x ^ 2 + x) LNX + (x + 1) ^ 2-2x ^ 2] / x = [2 (x ^ 2 + x) lnx-x ^ 2 + 2x + 1] / X when x = 1, G' (1) = 0, x = 1 is the minimum point = the minimum point, so g (x) ≥ g (1) = 0, that is (x + 1) F

Plane vector, a = (x1, Y1) B = (X2, Y2) how to express a * B? (I'm not sure all the time)

a.b =(x1,y1). (x2,y2) = x1x2+y1y2

Seeking the case materials in argumentative papers On the courage to face the reality, see the reality, self-confidence, not afraid to see their own lack of that side of the material examples