Question

a- 4y
b- 5x
c- 4/x
d- y/5
e- 4y/5x
​

Answer 1

$\sf{\sqrt{\dfrac{\sqrt{256y^4}}{\sqrt{625x^4}}}=\sqrt{\sqrt{\dfrac{256y^4}{625x^4}}}=\sqrt[2\cdot2]{\dfrac{256y^4}{625x^4}}}\\\sf{\sqrt[ \diagup\!\!\!\!4]{\dfrac{4^{ \diagup\!\!\!\!4}y^{ \diagup\!\!\!\!4}}{5^{ \diagup\!\!\!\!4}x^{ \diagup\!\!\!\!4}}}=\dfrac{4y}{5x}}$