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2/(5x+10) = -3/( x²-4)
5x+10≠0 x²-4≠0
5x≠-10 x²≠4
x≠-2 x≠-2 x≠2 D=R/{ -2,2}
2/ 5(x+2) +3/ (x+2)(x-2)=0
[2(x-2) +15] / [ 5(x+2)(x-2)]=
2x-4+15=0
2x=-11
x=-5,5
2]
(2x+5) /(x²-1)=1/(x+1)
x+1≠0 (x+1)(x-1)≠0
x≠-1 x≠1
D=R/{-1,1}
x²-1=(2x+5)(x+1)
x²-1=2x²+2x+5x+5
x²+7x+6=0
Δ=49-24=25 x1=[-7-5]/2=-6 x2=[-7+5]/2=-1∉D
odp. x=-6
3]
6/x -1= 2/(x-1)
x≠0 i x≠1
D=R/{ 0,1}
(6-x) /x =2/(x-1)
2x=(6-x)(x-1)
2x=6x-6-x²+x
x²+2x-7x+6=0
x²-5x+6=0
Δ=25-24=1 x1=[5-1]/2=2 x2=[5+1]/2=3
4]
(2x+1) /( x²-9)=3/(x-3)
D=R/{ -3,3}
3x²-27=2x²-6x+x-3
x²+5x-24=0
Δ=25+96=121 x1=[-5-11]/2=-8 x2=[-5+11]/2=3∉D
odp. x=-8