
Dec 18th, 2018, 09:12 AM
#1
Thread Starter
PowerPoster
what is the difference between mobile and calculator?
see these expression:
on mobile, i get: 9
on calculator, i get: 1
seems that the mobile do 1st '6/2'... i belive these is wrong... but can anyone correct me?

Dec 18th, 2018, 09:46 AM
#2
Re: what is the difference between mobile and calculator?
Since there is an implied * between 2 and (2+1), it should go something like this:
6/2*(2+1) > 6/2*(3) > then / and * have the same priority, so working from left to right 6/2=3 and then 3*3=9
What calculator are you doing this on? On a TI86 it evaluates to 9.
On a TI85, 6/2(2+1) evaluates to 1, but 6/2*(2+1) evaluates to 9. I remember that the TI85 had a bug/feature where in this exact scenario implied multiplication immediately outside parenthesis was evaluated at a higher priority than when the multiplication symbol was used. Other calculators might do the same I guess.
My suggestion to avoid ambiguity is to be verbose with symbols and include the * symbol between 2 and (2+1) and you should get the same result on all platforms that properly follow order of operations.
Last edited by OptionBase1; Dec 18th, 2018 at 09:49 AM.

Dec 18th, 2018, 09:55 AM
#3
Thread Starter
PowerPoster
Re: what is the difference between mobile and calculator?
6/2(2+1) = 6/(4+2) = 6/6 = 1
is these correct(from what i remember)?

Dec 18th, 2018, 10:00 AM
#4
Re: what is the difference between mobile and calculator?
No.
http://mathforum.org/library/drmath/view/66676.html
Inside parenthesis are evaluated first
6/2(3)
2(3) implies 2*(3)
6/2*(3)
Division and multiplication are of equal priority and are then evaluated left to right
6/2=3, 3*3=9

Dec 18th, 2018, 10:07 AM
#5
Re: what is the difference between mobile and calculator?
If then intention is to get a response of 1 in this case, then in order for the denominator to equal 6 while following proper order of operations, and additional set of parenthesis are needed to enclose the intended denominator.
6/(2(2+1))

Dec 18th, 2018, 10:07 AM
#6
Thread Starter
PowerPoster
Re: what is the difference between mobile and calculator?
i must relearn again for i correct my math
i'm sorry, but can you show me step by step how resolve?
(i was reading that link.. but i'm Portuguese... maybe you resolve it, i can see better)

Dec 18th, 2018, 10:10 AM
#7
Re: what is the difference between mobile and calculator?
Your best bet would be to try to find a website that discusses Order of Operations that is in your native language. That will be more productive than anything I can offer.

Dec 18th, 2018, 10:20 AM
#8
Thread Starter
PowerPoster
Re: what is the difference between mobile and calculator?
now i have seen the post that you edit and the other one and from what from you said and what i read(thank you so much for the right words for i search) they match very well...
my 1st calculation wasn't my fault, but what i had learned on school... but seems that somethings was changed(i have 35 years old).
thank you so much for all... thank you

Dec 18th, 2018, 10:25 AM
#9
Thread Starter
PowerPoster
Re: what is the difference between mobile and calculator?
but maybe i was confused... thank you so much for correct me.. thank you
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