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Mathematics 15 Online
OpenStudy (anonymous):

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OpenStudy (anonymous):

multiple top and bottom of each fraction by their conjugates

OpenStudy (anonymous):

rationalise by multiplying both den and nom

OpenStudy (anonymous):

use \[\frac{a } {b}+\frac{c} { d}=\frac{ad+bc}{bd}\]

OpenStudy (anonymous):

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