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Math Help - quick question about division

  1. #1
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    quick question about division

    if i have something like

    g/kg*year, can that be re written as g/kg/year?
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  2. #2
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    if you have
    \frac{A}{BC}
    it is equal to
    \frac{\frac{A}{B}}{C} where B and C are interchangeable

    if you have \frac{A}{B}C=\frac{AC}{B}=\frac{C}{B}A
    it is NOT equal to
    \frac{\frac{A}{B}}{C}=\frac{\frac{A}{C}}{B}
    Last edited by 1005; July 14th 2010 at 04:09 PM.
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  3. #3
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    Quote Originally Posted by MottoV2 View Post
    if i have something like
    g/kg*year, can that be re written as g/kg/year?
    NO.
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  4. #4
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    You need parentheses! Just "g/kg*year" could be interpreted as (g/kg)year or as g/(kg*year).

    Similarly, "g/kg/year" could be either (g/kg)/year or as g/(kg/year).

    (g/kg)year is the same as (g*year)/kg while g/(kg*year) is the same as (g/kg)/year.
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  5. #5
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    Plus remember that g/(kg) = 1/k
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