43
2) (х-1)/(х-2)-1/(х-2)=2/х
(х-1-1)/(х-2)=2/х
(х-2)/(х-2)=2/х
1=2/х
х=2
4)(х-2)(х^2 +1)-2(х^2 +1)=0
(х^2 +1)(х-2-2)=0
(х^2 +1)(х-4)=0
х^2+1=0. х-4=0
х^2=-1. х=4
ответ: х=4
49
1) (3(х+1)-(4х-1)(х-1)-х^2 -5 +5х^2 -5)/(х^2 -1)=0
(3х+3-4х^2 +4х +х-1-х^2 -5+5х^2 -5)/(х^2 -1)=0
(8х-8)/(х^2 -1)=0
8х-8=0
8х=8
х=1
2)((х+2)^2 -х(х-4)-(х-2)^2 -4(3+х))/(х^2 -4)=0
(х^2 +4х+4-х^2 +4х -х^2 +4х-4-12-4х)/(х^2 -4)=0
(-х^2+8х-12)/(х^2 -4)=0
-х^2 +8х-12=0. /*(-1)
x^2 -8x +12=0
Д=64-48=16
х1=(8+4)/2=6
х2=(8-4)/2=2