Решение:
(12-4х)/(х²-9)=4(3-х)/{(х-3)(x+3)}=-4(x-3)/{(x-3)(x+3)}=-4/(x+3)
Ответ: -4/(х+3)
{2x-3>0
{16-5x<1
2x-3>0
2x>3
x>1.5
16-5x<1
-5x<1-16
-5x<-15
x> -15 : (-5)
x>3
{x>1.5
{x>3
\\\\\\\\\\\\\\\\\\\\\\\\\\\\
------- 1.5 -------- 3 -------------
\\\\\\\\\\\\\\\\
x>3
x∈(3; +∞)
<span>е1/5х=5
х=5 :1/5=5*5/1
х=25
проверим и подстави х
1/5*25= 25/5= 5</span>