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Math Help - Did I get these questions right?

  1. #1
    Newbie
    Joined
    May 2010
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    Did I get these questions right?

    I' trying to follow the PEMDAS order, but it doesn't seem to always work out.



    2 + [3 + 5 (2 + 1) ]=

    78.2


    3 - 2 * 4 / 2 =

    2


    6 { 3 + 5 / 2] =
    33


    9 - 4 (3 + 6 * 2) = __ + 1 =
    76


    9 - 4 (3 + 6 * 2) =
    75


    6 + {5 - [2 + (3 - 1) ] } =
    7


    6 - { 4 - [ 2 - (6 +20) ] } =
    30

    And then there's something as simple as:
    3 - 5 (2 - 4)
    I know first, it would be 2 - 4 = -2.

    But I'm not sure if I should multiply the parenthesis by BOTH 3 and 5, or just multiply 5 by the parenthesis, THEN subtract that number from 3?

    This is where the problem lies. Any help would be great, thanks.
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  2. #2
    Super Member bigwave's Avatar
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    honolulu
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    well the first one is

    2 + [3+5(3)]=
    2+[18]=20
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  3. #3
    A riddle wrapped in an enigma
    masters's Avatar
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    Big Stone Gap, Virginia
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    And the next one is

    3 - 2 * 4/2 = 3 - 2 * 2 = 2 - 4 = -1

    This one's not right, either: 9 - 4 (3 + 6 * 2) =

    9 - 4(3 + 12) = 9 - 4(15) = 9 - 60 = -51

    And your last one is incorrect: 6 - { 4 - [ 2 - (6 +20) ] } =

    6 - { 4 - [ 2 - 26 ] } = 6 - { 4 - [-24] } = 6 - { 4 + 24 } = 6 - 28 = -22

    And in this one: 3 - 5 ( 2 - 4 ) = 3 - 5 ( -2 ) = 3 + 10 = 13
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  4. #4
    Newbie
    Joined
    May 2010
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    Thanks for the help.

    I'm not sure if I should make a new topic, but am I also right in assuming that:


    1 - 2 (3 + 4) + 5 * 10 = -63


    9 - [ 7 - 5 (7 + 2) ] = 47


    16 / 2 * 4 + 5 (6 + 1) = 37


    6 (-3)
    ------- = 2
    -2 -7
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