Question

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Помогите

Answer 1

a) (5x^4 - 10x^3)/(10x^5) = 5x^3*(x - 2)/(5x^3*2x^2) = (x - 2)/(2x^2)

b) (a^2 + 4a + 4)/(4 - a^2) = (a + 2)^2 / [(2 - a)(2 + a)] = (a + 2)/(2 - a)

Answer 2

$\frac{1 {x}^{4} - 2x {}^{3} }{2 {x {}^{5} }^{} }$

$- \frac{(2 + a){2}}{(2 + a)(2 - a)} \\ \frac{2+а}{2 - a}$