Question

pls ans the question ​

Answer 1

Answer:

5/(x-1) + 1/(y-2) = 2 ....i)

6/(x-1) - 3/(y-2) = 1.... ii)

now put 1/(x-1) = A and 1/(y-2) = B in eqn i) and ii)

5A + B =2 }×3

6A + 3B =1 }×1

Subtracting

15A + 3B= 6

-6A - 3B =-1

9A=5

A=5/9

x-1 =5/9

x=5/9+1 = 14/9

put A=5/9

6A + 3B =1

6×5/9 + 3B = 1

3B = 1 - 10/3

3B = -7/3

B = -7/9

y-2 = -7/9

y = -7/9 +2

y = -7+18 / 9

y = 11/9

Answer 2

Step-by-step explanation:

Hartree-Fock theory, by assuming a single-determinant form for the wavefunction, neglects correlation between electrons. The electrons are subject to an average non-local potential arising from the other electrons, which can lead to a poor description of the electronic structure.