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Lê Quốc Trần Anh Coordinator

11/07/2017 at 13:35
Answers
2
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Prove that:

\(\dfrac{7x-21}{14x-42}=\dfrac{2}{4}\)


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  • ...
    Bui Duy Vuong 11/07/2017 at 14:39

    Condition determines: \(14x-42\ne0\Leftrightarrow x\ne3\).
    We have:
    \(\dfrac{7\left(x-3\right)}{14\left(x-3\right)}=\dfrac{7}{14}=\dfrac{7:7\times2}{14:7\times2}=\dfrac{2}{4}\)

    Lê Quốc Trần Anh selected this answer.
  • ...
    FA KAKALOTS 28/01/2018 at 22:14

    Condition determines: 14x−42≠0⇔x≠3.
    We have:
    7(x−3)14(x−3)=714=7:7×214:7×2=24


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