Выполните действия: 1) 5x^2/x-1-5x 2) 4m^2/3-m+4m 3) 8n/2-n-4n 4) 3a-6a^2/2a+5

Выполним действия: 

1) 5 * x^2/(x – 1) – 5 * x = (5 * x^2 * 1 – 5 * x * (x – 1))/(x – 1) = (5 * x^2 – 5 * x^2 + 5 * x)/(x – 1) = 5 * x/(x – 1);

2) 4 * m^2/(3 – m) + 4 * m = (4 * m^2 + 4 * m * (3 – m))/(3 – m) = (4 * m^2 + 12 * m – 4 * m^2)/(3 – m) = 12 * m/(3 – m);  

3) 8 * n/(2 – n) – 4 * n = (8 * n – 4 * n * (2 – n))/(2 – n) = (8 * n – 8 * n + 4 * n^2)/(2 – n) = 4 * n^2/(2 – n);

4) 3 * a – 6 * a^2/(2 * a + 5)  = (3 * a * (2 * a + 5) – 6 * a^2)/(2 * a + 5) = (6 * a^2 + 15 * a – 6 * a^2)/(2 * a + 5).