If P1 (- 3,4-a) and P2 (3, a) are symmetric about the Y axis, then a is equal to

If P1 (- 3,4-a) and P2 (3, a) are symmetric about the Y axis, then a is equal to

The abscissa of y-axis symmetry is opposite to each other, and the ordinate is the same
So 4-A = a = 2
Do not understand, welcome to ask~

Yesterday, I made a mistake when I divided the third power of LIM (n belongs to infinity) = (cube of N-N + 1) by [(square of N + 4N) half power + 3]
LIM (n belongs to infinity) = (cube of N-N + 1) divided by [(square of N + 4N) half power + 3N] and lim (n belongs to infinity) = (cube of N-N + 1) third power divided by [(square of N + 4N) half power + 3 times square of n]

LIM (n belongs to infinity) = (cube of N-N + 1) divided by [(square of N + 4N) half power + 3N]
The coefficient of the highest order term n of the numerator is 1, and the coefficient of the highest order term n of the denominator is 4
LIM (n belongs to infinity) = (cube of N-N + 1) divided by [(square of N + 4N) half power + 3N] = 1 / 4
LIM (n belongs to infinity) = (cube of N-N + 1) divided by [(square of N + 4N) half power + 3 times square of n]
The highest order of the numerator is n, the coefficient is 1, the highest order of the denominator is n ＾ 2, the coefficient is 2, so the limit is 0

What is 58 + 39 + 42 + 61? It's easy to calculate

58 + 42 = 100, 39 + 61 = 100, so the sum is 200

As shown in the figure, AC = AE, ∠ BAF = ∠ bgd = ∠ EAC, is there a triangle congruent with △ Abe in the figure? And prove

In △ ABF and △ DFG, ∠ BAF = ∠ bgd, ∠ BFA = ∠ DFG, ∠ B = ∠ D, ∵ BAF = ∠ EAC, ∵ BAE = ∠ DAC, ∵ AC = AE, ∵ BAE = ∠ DAC, ∠ B = ∠ D, in △ BAE and △ DAC, ∠ B = ∠ D ∠ BAE = ∠ dacae = AC ≌ BAE ≌ DAC (AAS). Answer: Yes. △ BAE ≌ DAC

Nineteen divided by eleven fifths and three times five fifths
It's easy. In ten minutes

19÷11/5+3×5/11
=19×5/11+3×5/11
=(19+3)×5/11
=22×5/11
=10

Using Vandermonde determinant to calculate the fourth order determinant, the first line: 1, the second line: 437 -
Using Vandermonde determinant to calculate the fourth order determinant, the first line is 1 1, the second line is 4 37 - 5, the third line is 16 9 49 15, the fourth line is 64 27 343 - 125,

1 1 14 3 7 - 516 9 49 1564 27 343 - 125 = 1 1 1 14 3 7 - 54 ^ 2 3 ^ 2 7 ^ 2 (- 5) ^ 2 - 104 ^ 3 3 3 ^ 3 7 ^ 3 (- 5) ^ 3 split the determinant by column 4 = 1 1 1 1 04 3 7 - 5 4 3 7 04 ^ 2 3 2 7 ^ 2 (- 5) ^ 2 + 4 ^ 2 3 ^ 2 7 ^ 2 - 104 ^ 3 3 3 3 7 ^ 3 (- 5) ^ 3

55.68 divided by 7.6

7.3263

What's the point of measuring Pi? Is pi a fixed constant?

In a solution with a certain pH, the tendency and degree of amino acid dissociation into cation and anion are equal, the net charge is zero, and the solution pH is called the isoelectric point of the amino acid, When the pH value of the external solution is greater than the PL value of zwitterions, the protons of zwitterions are negatively charged. When the pH value of the external solution is less than the PL value of zwitterions, the protons of zwitterions are positively charged
For the same amino acid, PI is fixed
The pH value of body fluid is not constant. The different pH value and the different decomposition of amino acids directly affect the metabolism of amino acids in human body

11 out of 45 times 81 out of 2=（

=9.9
ninety-nine-tenths

TaNx = 2 find the value of tan2 (x-45 degrees)

tan(x-45`)=1/3
tan2(x-45`)=3/4