Please go step by on how to do these

Find dy/dx in simplest factored form

1) (2x-1)/(x^2+100)

2) ln(x^2+5)/(x^2+5)

3) e^x+y

The answers are

1) -(3x^2+2x+1)

(2x+1)^(1/2)(x+1)^(2)(x-1)^(2)

2) 2x{1-ln(x^2+5)}

(x^2+5)^(2)

3) e^(x+y) or y

1-e^(x+y) 1-y