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Thread: what is the difference between mobile and calculator?

  1. #1

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    what is the difference between mobile and calculator?

    see these expression:
    Code:
    6/2(2+1)
    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?
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  2. #2
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    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 TI-86 it evaluates to 9.

    On a TI-85, 6/2(2+1) evaluates to 1, but 6/2*(2+1) evaluates to 9. I remember that the TI-85 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.

  3. #3

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    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)?
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  4. #4
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    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

  5. #5
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    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))

  6. #6

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    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)
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  7. #7
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    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.

  8. #8

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    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
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  9. #9

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    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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