3n^2 - n/ n^2 - 1 / n^2/ n+1

is the answer 3n-1/n^2-n or 3-n/ n-1

is this what the problem looks like:

(( 3n)^2 - (n/n^2) - 1)/ (n^2 / n+1)?

please repost using brackets, which are essential in this kind of typing.

e.g near the end you have consecutive divisions, that is very unusual
.... - 1 / n^2/ n+1

To simplify the given expression:

3n^2 - n / n^2 - 1 / n^2 / n + 1,

we need to follow the rules of arithmetic operations.

First, let's simplify the expression inside the parentheses:

3n^2 - n

Now, divide it by the expression after the forward slash:

(n^2 - 1)

Since division is the same as multiplying by the reciprocal, this can be written as:

(3n^2 - n) * (n^2 + 1) / (n^2 - 1)

Next, multiply the numerator:

(3n^2 - n) * (n^2 + 1) = 3n^4 + 3n^2 - n^3 - n

Then, divide by the denominator:

3n^4 + 3n^2 - n^3 - n / (n^2 - 1)

Now, let's simplify the expression after the next forward slash:

(n^2)

Again, this is the same as multiplying by the reciprocal:

(3n^4 + 3n^2 - n^3 - n) / (n^2 - 1) * (1/n^2)

Now, multiply the numerator:

(3n^4 + 3n^2 - n^3 - n) / (n^2 - 1) * (1/n^2) = 3n^2 + 3 - (n/n^2) - (1/n)

Finally, let's simplify the remaining terms:

3n^2 + 3 - (n/n^2) - (1/n)

Combining like terms, we can rewrite this as:

3n^2 + 3 - 1/n - 1/n^2

Therefore, the simplified expression is:

3n^2 + 3 - 1/n - 1/n^2