Question 13183
1. {{{x^2(x+1)/x(x+1)}}}=x
 
2. {{{(x+4)(x-3)/(x+5)(x+4)}}} ={{{(x-3)/(x+5)}}}
 
3. {{{(5r-20)/(3r-12)}}}={{{5(r-4)/3(r-4)}}}={{{5/3}}}
 
4. {{{(5s-25)/(s^2 - 25)}}}={{{5(s-5)/(s+5)(s-5)}}}={{{5/(s+5)}}}

OK