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AndreeaParaschiv
Pe: 2013-04-14T12:34:22+03:00 In: In:

Ecuati, clasa a VII a algebra

Rezolvati in Q urmatoarele ecuati :

a) 5x la a doua = 108 / 5

b) 42x la a doua = 150 / 7

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Rezolvati in R urmatoarele ecuati

a) x la a doua = 4,1(6)

b) x la a doua = 0,2(7)

Multumesc anticipat. ^^
😀
/ – supra.

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2 raspunsuri

  1. edy8
    maestru (V)

    AndreeaParaschiv wrote: Rezolvati in Q urmatoarele ecuatii :

    a) 5x la a doua = 108 / 5

    .

    \it{\bl 5x^2 =\frac{108}{5} \Longrightarrow x^2 = \frac{108}{25}\ \Longrightarrow \sqrt{x^2} = \sqrt{\frac{108}{25}} \Longrightarrow |x| = \frac{\sqrt{108}}{\sqrt{25}} \Longrightarrow x = \pm \frac{\sqrt{36\cdot3}}{5}}

  2. dan
    expert (VI)

    AndreeaParaschiv wrote:
    Rezolvati in R urmatoarele ecuati

    a) x la a doua = 4,1(6)

    b) x la a doua = 0,2(7)

    Multumesc anticipat. ^^
    😀
    / – supra.

    \rm{\bl\\ 4,1(6)=\frac{416-41}{90}=375/90=75/18=\frac{25}{6} \surd \Rightarrow |x|=\sqrt{\frac{25}{6}}= ... ;\\ 0,2(7)= 25/90 \surd \Rightarrow |x| = \sqrt{\frac{25}{90}}= ... ;

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