Ответ:

  1. \(\frac{6(4d+7)-7(d-6)}{42d}=\frac{17d+84}{42d}\).
  2. \(\frac{p(m-n)-m(p-n)}{mnp}=\frac{m-p}{mp}\).
  3. \(\frac{a(6a+2)-(2a+4)}{a^2b}=\frac{6a^2-2a-4}{a^2b}\).
  4. \(\frac{c^2-16-c(c-9)}{c^6}=\frac{9c-16}{c^6}\).
  5. \(\frac{x^2-(1+x^2)}{x^5}=-\frac1{x^5}\).
  6. \(\frac{d(1-ab)-b(1-ad)}{abcd}=\frac{d-b}{abcd}\).