1
1)2+1/(5-x²)=(10-2x²+1)/(5-x²)=(11-2x²)/(5-x²)
2)3+(5-x²)/(11-2x²)=(33-6x²+5-x²)/(11-2x²)=(38-7x²)/(11-2x²)
3)1+(11-2x²)/(38-7x²)=(38-7x²+11-2x²)/(38-7x²)=(49-9x²)/(38-7x²)
(49-9x²)/(38-7x²)=31/24
24(49-9x²)=31*(38-7x²)
1176-216x²=1178-217x²
217x²-216x²=1178-1176
x²=2
x=-√2 U x=√2
2
1)1+1/(10-x²)=(10-x²+1)/(10-x²)=(11-x²)/(10-x²)
2)2+(10-x²)/(11-x²)=(22-2x²+10-x²)/(11-x²)=(32-3x²)/(11-x²)
3)1-(11-x²)/(32-3x²)=(32-3x²-11+x²)/(32-3x²)=(21-2x²)/(32-3x²)
(21-2x²)/(32-3x²)=3/5
5(21-3x²)=3(32-3x²)
105-10x²=96-9x²
10x²-9x²=105-96
x²=9
x=-3 U x=3