Question

Решите очень срочно!!!Даю 40 баллов!!! Номер 5 и 7,8!!

Answer 1

$1)\frac{t+9}{6} =0\\t=-9\\2)\frac{t+9}{6} =1\\x+9=6\\x=-3\\3)\frac{t+9}{6} \ \textgreater \ 1\\x\ \textgreater \ -3\\4)\frac{t+9}{6} \ \textless \ 1\\x\ \textless \ -3\\...............................\\\frac{3u}{u^2-9} =0\\u \neq 3\\u \neq -3\\3u=0\\u=0\\2)\frac{6}{u-8} +\frac{9}{u+1} =0\\u \neq -1\\u \neq 8\\\frac{6(u+1)+9(u-8)}{(u-8)(u+1)}=0 \\15u-66=0\\y=\frac{22}{5} =4,4\\..........................................\\1) \frac{x^2+6x-6}{x-6} =0\\x \neq 6\\x^2+6x-7=0\\a+b+c=0\\x_1=1\\x_2=-7\\2)\frac{x^3-x^2+x-1}{x-5} \\x \neq 5\\x^3-x^2+x-1=0\\x^2(x-1)+x-1=0\\(x-1)(x^2+1)=0\\x=1$
$3)\frac{x^2-6x^3-5x}{x-14} =0\\x \neq 14\\x^2-6x^3-5x=0\\x(x-6x^2-5)=0\\x=0\\D\ \textless \ 0\\x=0$