Known: x2 power; - X-1 = 0, find the value of: - X3 power; + 2x2 power; + 2003?

Known: x2 power; - X-1 = 0, find the value of: - X3 power; + 2x2 power; + 2003?

Solution; known: x2 power; - X-1 = 0
So x ^ 2 = x + 1, x ^ 2-x = 1
-X^3+2X^2+2003
=X^2(2-X)+2003
=(X+1)(2-X)+2003
=-X^2+X+2+2003
=-(X+1)+X+2+2003
=2004

The fourth power of 4x + X3 + x2 + X

Is it like this 4 (x ^ 4 + x ^ 3 + x ^ 2 + x)
＝4[x^2(x^2+1)+x(x^2+1)]
=4(x^2+1)(x^2+x)
=4x(x^2+1)(x+1)
If it's 4x ^ 4 + x ^ 3 + x ^ 2 + X, then it's OK to extract the common factor
=X(4X^3+X^2+X+1)

English translation
Translation: account

ac.count
n. (noun)
A narrative or record of events.
To narrate an event or a record of an event
A reason given for a particular action.
Reason: the reason for a particular action
Abbr.a/c,acct.
Abbreviation a / C, acct
A formal banking,brokerage,or business relationship established to provide for regular services,dealings,and other financial transactions.
Account: a formal banking, brokerage, or business relationship established to provide regular services, transactions, and other financial activities
A precise list or enumeration of financial transactions.
An exact list or data of economic activity
Money deposited for checking,savings,or brokerage use.
Deposit: money saved for payment, savings, or brokerage
A customer having a business or credit relationship with a firm:
Customer: a customer who has a business or reputation relationship with a company
salespeople visiting their accounts.
The salesman visited their customers
Worth,standing,or importance:
Value, status, importance:
a landowner of some account.
Rich landlords
Profit or advantage:
Profit, advantage:
turned her writing skills to good account.
Use her writing skills to make a profit
v. Tr. (transitive verb)
ac.count.ed , ac.count.ing , ac.counts
To consider as being; deem.See Synonyms at consider See Usage Note at as 1
Think of; regard as

Given that the first n terms of the arithmetic sequence {an} and Sn satisfy: SN = N2 + 2n + a (n ∈ n *), then the real number a=______ ．

When n ≥ 2, an = sn-sn-1 = 2n + 1 ∫ A2 = 5, A3 = 7 ∫ d = 7-5 = 2A1 = 1 + 2 + a = 3 + a ∫ {an} is an arithmetic sequence ∫ A1 = a2-d = 3 = 3 + a ∫ a = 0, so the answer is: 0

Z = 3 (x ^ 2) y + e ^ (XY) for DZ

This is a total differential, DZ / DX = 6xy + X * e ^ XY, DZ / dy = 3x ^ 2 + X * e ^ XY, so DZ = (6xy + X * e ^ XY) DX + (3x ^ 2 + X * e ^ XY) dy

A coal truck has 24 cars, each car is 6 meters long and 3 meters wide, and the height of coal loading is 1.5 meters. Each cubic meter of coal weighs 2 tons. How many tons of coal does this train carry?

6*3*1.5*24*2
=18*3*24
=54*24
=1296 tons

The concept of intersecting line and opposite vertex angle
Will use the complementary angle of the remaining angle and the nature of the vertex angle to calculate the angle

Two lines intersect, and there is only one intersection
There will be four angles. Two pairs of equal angles
Vertex angle refers to two angles with the same vertex and two sides of the angle on the same line
Equal to vertex angle
If the sum of two angles equals 90 degrees, then the two angles complement each other
If two angles add up to 180 degrees, then the two angles complement each other

The function f (x) defined on R satisfies f (1) = 2, and f (XY) = f (x) f (y) - f (y) - x + 1 for any x belonging to R

y=1
f(xy) = f(x)f(y)-f(y)-x+1
f(x) = 2f(x) - 2 - x + 1
f(x) = x+1

Physical properties of water

Physical properties of water
(editor's note: People's education press nature Volume 4 Lesson 1 water)
Pure water is colorless, odorless, tasteless, transparent liquid. The freezing point of water is 0 ℃ and the boiling point is 100 ℃. The maximum density of water is 1g / cm3 at 4 ℃. When water freezes, the density decreases and the volume expands

The relationship between sound speed and temperature
We know that "the higher the air temperature is, the faster the sound travels". What are the applications in our daily life? Please give us an example!

Generally speaking, the propagation speed of sound is only related to the medium. The propagation speed of the same medium will be different under different conditions. But this is the result of scientific research, and there is no need to study it in detail. The following is the relationship between sound and temperature. Sound is the energy transmission of sound body in the form of sound wave