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URGENT VA ROOG,DAU CORANĂ Calculati a)-√5x+2,5=0 b)1 supra x-1=2


Răspuns :

a)

[tex] - \sqrt{5} x + 2.5 = 0 \\ - \sqrt{5} x = - 2.5 \\ \sqrt{5} x = 2.5 \\ x = \frac{25}{10 \sqrt{5} } = \frac{ \sqrt{5} }{2} [/tex]

b)

[tex] \frac{1}{x - 1} = 2 \\( x - 1) \times 2 = 1 \\ 2x - 2 = 1 \\ 2x = 3 \\ x = 1.5[/tex]