Question

[Khanh Le]

đưa thừa số ra ngoài dấu căn

Answer 1

[YangSu]

\(\sqrt{\dfrac{45\left(x+y\right)^2.y^2}{16}}\left(dkxd:x\ge0,y\ge0\right)\\ =\dfrac{\sqrt{45\left(x+y\right)^2.y^2}}{\sqrt{16}}\\ =\dfrac{\sqrt{45}.\sqrt{\left(x+y\right)^2}.\sqrt{y^2}}{\sqrt{4^2}}\\ =\dfrac{\sqrt{3^2.5}.\left|x+y\right|.\left|y\right|}{4}\\ =\dfrac{3\sqrt{5}\left(x+y\right).y}{4}\\ =\dfrac{3\sqrt{5}\left(xy+y^2\right)}{4}\)

Answer 2

[Trần Minh Tiến]

x^ 3 mà