How to do a division of fractions?

How to do a division of fractions?
Summary:
The quotient is the result of dividing two or more fractions.
To do a division of fractions, you need to follow 4 steps:
o 1 : Invert the 2nd fraction and change the sign (to be able to multiply the first fraction by the second fraction)
o 2 : Multiply the numerators together
o 3 : Multiply the denominators together
o 4 : Make the fraction irreducible
ATTENTION : We don't have the right to simplify 2 numerators between them or 2 denominators between them.
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Video links:
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The definition, simplification and amplification of a fraction: • C’est quoi la définiti...