Question

При каких значениях аргумента:
1) значение f(x)=$\frac{9}{x+5}$=3
2) значение g(x)=$\frac{7x+1}{4}$ +2 =11
3) значение f(x)=$\frac{5}{x+3}$ + $\frac{2}{3}$ =1

Answer 1

$1) x+5 = 9/3 =\ \textgreater \ x = 9/3 - 5 = -2$
$2) (7x+1) / 4 = 9 =\ \textgreater \ 7x+1=36 =\ \textgreater \ 7x = 35 =\ \textgreater \ x = 5$
$3) 5/(x+3) = 1/3 =\ \textgreater \ x+3 = 5 : 1/3 =\ \textgreater \ x+3 = 15 =\ \textgreater \ x = 12$