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Re: Calculator question
Posted:
Jul 23, 1998 11:40 AM


>Jerry Brodkey wrote: > >> One of my former students who is now starting to teach asked me the >> following question for which I don't have a good answer; >> >> On the TI82: 10/5*2 equals 4 >> >> but 10/5(2) equals 1.
This is the (in)famous "implied multiplication" which takes precedence over division.
>> The order of operations rules that I've been using for twenty years would >> agree with the answer equal to one. Multiplication and division are >> "equal" in power and you work from left to right. The parentheses in this >> case don't change the order of operations.
OK. Not (in)famousINfamous. TI just shouldn'ta done it. They did it to make sin 2x mean sin(2x)noble goal, but caused problems, such as the one here. Graph the line "y equals onehalf of x" via y1=1/2x. Ya get a hyperbola.
This feature (it is NOT a bugit was carefully planned) is not present on the 83 and up but IS on the 85 (which predates even the 82).
Dave Slomer Retired AP Calculus teacher Will Algorise For Food http://www.geocities.com/capecanaveral/lab/8692



