Crear actividad
Jugar Test
1. 
Resolver: X+2/ x2-1
2. 
Resolver: x-2/x2+x-6
3. 
Resolver: 2x+4/2x-4
4. 
Resolver: x2+4/x2-4x+4
5. 
Resolver: x2+x-2/x+2