Answer and Step-by-step explanation:
Let's Solve your equations !
For The first question, The answer is :

You have to factor the numerator and the denominator and cancel the common factors.
For the second question, The answer is :

You have to Reduce the expression, If possible, By cancelling the common factors.
For the Third question, The answer is :

Just like the first one, You have to factor the numerator and the denominator and cancel the common factors.
And For the fourth question, The answer is :

and again, just like the second one, You have to Reduce the expression, If possible, By cancelling the common factors.