[trentfowler]

I don't think it's ambiguous in the least. Sure, if I were programming I would add another set of parentheses and the implied * symbol so that it's crystal clear and more reader friendly, but I would toss any calculator that gave me anything other than 6÷2(1+2)=9. I've never read or heard anywhere that an implied * symbol has higher priority than an explicit one. But if that is a reasonable interpretation, Casio has a responsibility to give consistent results across it's entire calculator line.