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Fie proportia [tex] \frac{x-1}{3} = \frac{4}{5} [/tex]
a) x=...
b) [tex] x^{-1} - \frac{5}{17} =..[/tex]
c) [tex] \frac{1}{17} x : 5^{-1} [/tex]

Răspuns :

⇒5(x-1)=3·4
5x-5=12⇒5x=12+7
5x=17⇒x=17/5⇒   x=3,4
b) ⇒1/x-5/17=17-5x=0⇒
-5x=-17      ·(-1)
x=17/5
c)⇒x/17:1/5=x/17·5/1=5x/17

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