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B Indefinite Integral, doubt...

  1. Oct 12, 2016 #1
    upload_2016-10-12_22-4-35.png

    doubt in this fraction in here upload_2016-10-12_22-1-36.png Because he, simplify 12 with 4 ?? do not understand!
    someone could make another example ,with fraction ! Thank you!
     
  2. jcsd
  3. Oct 12, 2016 #2

    fresh_42

    Staff: Mentor

    Do you know how to handle ##\frac{1}{12}\,\cdot\, \frac{1}{\frac{5}{4}} = \frac{\frac{1}{12}}{\frac{5}{4}}##?
     
  4. Oct 12, 2016 #3

    jim mcnamara

    User Avatar

    Staff: Mentor

    You have a mathjax typo @fresh_42 ....
     
  5. Oct 12, 2016 #4

    fresh_42

    Staff: Mentor

    Yeah, failed attempt to enlarge the numbers.
    Thanks, anyway!
     
  6. Oct 12, 2016 #5
    fresh 42 Thank you, is composite or Mixed
    fraction ?? the account of this? u ^ 5/4, you wrote the same number 1 or u = 1 ?? I then replace u by 1 correct ??
     
  7. Oct 12, 2016 #6

    fresh_42

    Staff: Mentor

    No, I left out the ##u-##term. With it, it reads

    ##-\frac{1}{12}\,\cdot \, \frac{u^{5/4}}{\frac{5}{4}} = -\frac{\frac{1}{12}}{\frac{5}{4}} \,\cdot \, u^{5/4} = -\frac{1}{12} \, \cdot \, \frac{4}{5} \,\cdot \, u^{5/4} = -\frac{1\,\cdot\,4}{12 \,\cdot\, 5}\,\cdot\, u^{5/4} =-\frac{4}{60}\,\cdot\, u^{5/4} = -\frac{1}{15}\,\cdot\, u^{5/4}##

    Look at the fractions here and how they are divided!
     
  8. Oct 13, 2016 #7
    Thank you, now easier!
     
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