WEB recomendada
http://ed21.webcindario.com/id291.htm
http://www.matematicasbachiller.com/
http://descartes.cnice.mec.es/
http://www.vitutor.com
http://ed21.webcindario.com/id291.htm
http://ed21.webcindario.com/id341.htm
http://usuarios.multimania.es/equatdiff/id17.htm
Background Colour
Font Face
Font Kerning
Font Size
Image Visibility
Letter Spacing
Line Height
Link Highlight
Text Colour