Worked hard on a big revision of my risps. Weeding out mistakes, making tasks clearer, writing Geogebra and Excel files, all with better navigation; look out for the free eBook coming out in January!

Found this task somewhere on the net recently. I have an answer but my method is a bit tortured! Does anyone have a nice technique for this?

Can you show c = (ab+1)/(a+b)?

Dipping my toe into this Blue Sky thing... Hello! Anybody out there? Jonny