What is the parameter equation of the equation y = - x + 1 Is x = - radical 2 / 2, y = 1 + radical 2 / 2 Or x = radical 2 / 2, y = 1-radical 2 / 2

What is the parameter equation of the equation y = - x + 1 Is x = - radical 2 / 2, y = 1 + radical 2 / 2 Or x = radical 2 / 2, y = 1-radical 2 / 2

When transforming a parametric equation into an ordinary equation, you should pay attention to the influence of parameters, that is, the influence of parameters on the de value of the ordinary equation. When transforming an ordinary equation into a parametric equation, all the parameters can be selected at will. The two you wrote are OK. The reason why you are not sure is that the geometric meaning of the parameters in the two parametric equations is different. The parameters in equation 1 have clear geometric meaning, The parameters in equation 2 have no clear geometric meaning
The parameter t is missing from your equation

Factorization (some use cross factorization)
x³-4x^-21x
3x³-10x^+3x
The fourth power of x-6x ^ - 27
The fourth power of X - 10x ^ + 9
(2x-3)^+3(2x-3)+2
(x^+8x)^+22(x^+8x)+120

After X, 1 1 - 7 3
After X, 3 1 - 1 - 3
1 1 - 9 3 were decomposed after two times
1-1-9 twice before decomposition
Look at 2x-3 with one number
Consider x ^ 2 + 8x as a number
Try to do it yourself

As shown in the figure, the image of the first-order function y = - 4,3x + 8 intersects with the x-axis and y-axis respectively. A, B and m are points on the line ob. If the triangle ABM is folded along the line am, the point B just falls at the point B 'on the x-axis. The analytic expression of the first-order function corresponding to the line am is obtained
_____ |____

When x = 0, y = - 4 / 3x + 8 = 8, that is, B (0,8),
When y = 0, x = 6, that is, a (6,0),
So AB = ab ′ = 10, that is, B ′ (- 4, ′ 0),
Because points B and B 'are symmetric with respect to am,
So the midpoint (- 2,4) of BB 'is on the line am,
Let the analytic expression of the straight line am be y = KX + B, and let (- 2,4); (6,0); (2,4); (6,0); (2,4); (6,0); (2,4); (6,0); (2,4); (6,0),
Substituting can get
y=- 1/2x+3,

Limit limx (x → + ∞) [√ (x ^ 2 + 1) - x]=

Molecular rationalization
x^2+1-x^2/[√(x^2+1)+x]=1/[√(x^2+1)+x]
When
(x→＋∞)
The limit is 0

The parabola is a quadratic function y = ax ^ 2 + BX + C, the axis of symmetry is a straight line x = 2, and it passes through points (0,1), (- 1,6)

The symmetry axis of y = ax ^ 2 + BX + C is a straight line x = 2, ∧ - B / 2A = 2, ∧ B = - 4A
And y = ax ^ 2 + BX + C passes through points (0,1), (- 1,6)
Substituting: C = 1, A-B + C = 6
A = 1, B = - 4, C = 1
∴y =x²-4x+1

There is only one problem to solve binary linear equations
Let x, y, Z, t satisfy the equations
{ x+y=3 ①
{ y+z=5 ②
{ z+t=2 ③
{ t+x=0 ④
Find the value of X, y, Z, t

(1)+(3)-(2)
Just get (4)
So there are actually only three equations
So there are countless solutions

Why is the slope k in the U-I image equal to the internal resistance of the power supply? Should it be equal to the external circuit resistance? Because the u here is not the terminal voltage? It should be the external circuit resistance
Why is the slope k equal to the internal resistance of the power supply? Should it be equal to the resistance of the external circuit? Because the u here is not the terminal voltage? Should it be the voltage of the external circuit?

U=E-Ir
The above equation is a linear equation, so the slope is r, that is, the slope is the internal resistance of the power supply

How to factorize a ^ 4 + B ^ 4? Difference?

In May 2012, Xiaohong's mother deposited 10000 yuan in the bank for two years at an annual interest rate of 4.40%. Two years later, Xiaohong's mother could withdraw it from the bank
() yuan
judge
The reciprocal of the false fraction is smaller than 1
The first term of a ratio is multiplied by 3, and the second term of a ratio is also multiplied by 3
44 out of 45 times 46 equals (1 + 45) times 44 out of 45 plus 44 equals 44 out of 15
If a fraction is divided by a true fraction, the quotient must be less than the divisor ()

In May 2012, Xiaohong's mother deposited 10000 yuan into the bank for two years at an annual interest rate of 4.40%. Two years later, Xiaohong's mother could withdraw (10880) yuan from the bank, 10000 + 10000 × 4.40% × 2 = 10000 + 880 = 10880 (yuan). It was judged that the reciprocal of the false score was smaller than 1. (wrong) some false scores were equal to 1, so its

Please give me the formula
There are two pools of goldfish. The mantissa of pool a is 3:2 compared with that of pool B. later, 18 goldfish are fished out of pool a and put into pool B. the mantissa of pool a accounts for 45% of the mantissa of goldfish in the two pools. How many goldfish are there in pool a and pool B?
Please list the calculation formula

Let a have 3x fish. B have 2x fish
3x-18 /3x+2x=0.45
After solving x, calculate 3x