Question

Представьте в виде дроби. Прикреплено.

Answer 1

$1. \ frac{ x^{2} -9}{ x^{2} -5x} * frac{x-5}{x+3}= frac{(x-3)(x+3)}{x(x-5)}* frac{x-5}{x+3}= frac{x-3}{x} \ \ 2. \ frac{ac-cd}{ad}* frac{d}{ c^{2} } = frac{c(a-d)}{ad} * frac{d}{c^{2} } = frac{a-d}{ac} \ \ 3. \ frac{x+ x^{3} }{n- n^{2} } : frac{ x^{2} +1}{ n^{3} - n^{2} } = frac{x(1+ x^{2} )}{n(1-n)}* frac{ n^{2}(n-1) }{ x^{2} +1}=- nx$