[Siren-Of-Step]

ถ้า $$\frac{a}{b} = \frac{c}{d} = \frac{e}{f}$$ จงพิสูจน์ว่า $$\frac{a}{d} = \sqrt{\frac{a^5+b^2c^2+a^3c^2}{b^4c+d^4+b^2cd^2} }$$