![xpx+x\sqrt[]{\frac{Px}{Py}}py=r](/latexrender/pictures/1053ab1623efff3e5736045e27daaf79.png "xpx+x\sqrt[]{\frac{Px}{Py}}py=r")
porque vira
![xpx+x\sqrt[]{Px}\sqrt[]{Py}=r](/latexrender/pictures/91118fb07125ec34e979410efa08a7c4.png "xpx+x\sqrt[]{Px}\sqrt[]{Py}=r")
porque some o 
Depois eu naõ consigo fazer essa outra passagem
![y=\frac{r}{Px+\sqrt[]{Px}\sqrt[]{Py}}\sqrt[]{\frac{Px}{Py}}](/latexrender/pictures/c09dc5a86f97cb309930c5b1f06d0131.png "y=\frac{r}{Px+\sqrt[]{Px}\sqrt[]{Py}}\sqrt[]{\frac{Px}{Py}}")
porque vira
![r=\frac{r}{\sqrt[]{Px}(\sqrt[]{Px}+\sqrt[]{Py)}}\sqrt[]{\frac{Px}{Py}}](/latexrender/pictures/2e22f58456db6ad8325c83ebaa22725f.png "r=\frac{r}{\sqrt[]{Px}(\sqrt[]{Px}+\sqrt[]{Py)}}\sqrt[]{\frac{Px}{Py}}")
porque
vira ![\sqrt[]{Px}](/latexrender/pictures/04d8347b25aa5e75b7071bdbbbfd9071.png "\sqrt[]{Px}")
e depois no final tudo isso tem como resultado
![y=\frac{r}{Py+\sqrt[]{Px}\sqrt[]{Py}}](/latexrender/pictures/c55eb258b660a5f4a6ce9d6c42f1cd56.png "y=\frac{r}{Py+\sqrt[]{Px}\sqrt[]{Py}}")
Alguém pode me ensinar as passagens, por favor?
Grato
José Mario
por jmario » Ter Jun 08, 2010 09:13
porque some o vira 
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![\frac{\sqrt[]{\sqrt[4]{8}+\sqrt[]{\sqrt[]{2}-1}}-\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}-1}}}{\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}+1}}}](/latexrender/pictures/981987c7bcdf9f8f498ca4605785636a.png "\frac{\sqrt[]{\sqrt[4]{8}+\sqrt[]{\sqrt[]{2}-1}}-\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}-1}}}{\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}+1}}}")
![\sqrt[]{2}](/latexrender/pictures/f21662d1cabab6e8b273a4b6f1cd663a.png "\sqrt[]{2}")
(dica : igualar a expressão a 
e elevar ao quadrado os dois lados)