Question

[đặng thị phương thảo]

câu a \(\dfrac{\sqrt{m^3}+4\sqrt{mn^2}-4\sqrt{m^2n}}{\sqrt{m^2n}-2\sqrt{mn^2}}\left(m>0,n>0\right)\) câu b \(\dfrac{x\sqrt{x}-1}{x-1}\left(x>0\right)\) câu c \(\sqrt{50x^3y^5}-\dfrac{2y^2}{x^2}\sqrt{32x^7y}+\dfrac{3xy}{2}\sqrt{2xy^2}\)\(\left(x>0,y>0\right)\) câu d \(\left(x+2\right)\sqrt{\dfrac{2x-3}{x+2}}\) câu e \(\dfrac{a+b}{a}\times\sqrt{\dfrac{ab^2+ab^3}{a^2+2ab+b^2}}\left(a>0,b>-1\right)\)

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(=\dfrac{\sqrt{m}\left(m+4n-4\sqrt{mn}\right)}{\sqrt{mn}\left(\sqrt{m}-2\sqrt{n}\right)}\)

\(=\dfrac{1}{\sqrt{n}}\cdot\left(\sqrt{m}-2\sqrt{n}\right)\)

b: \(=\dfrac{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)

\(=\dfrac{x+\sqrt{x}+1}{\sqrt{x}+1}\)

c: \(=\sqrt{5^2\cdot2\cdot x^2y^4\cdot xy}-\dfrac{2y^2}{x^2}\cdot4\sqrt{2}\cdot x^3\sqrt{xy}+\dfrac{3}{2}xy\cdot\sqrt{2}\cdot y\cdot\sqrt{xy}\)

\(=5xy^2\sqrt{2xy}-8\sqrt{2xy}xy^2+\dfrac{3}{2}xy^2\cdot\sqrt{2xy}\)

\(=-\dfrac{3}{2}\sqrt{2xy}\)

d: \(=\left(x+2\right)\cdot\dfrac{\sqrt{2x-3}}{\sqrt{x+2}}=\sqrt{\left(2x-3\right)\left(x+2\right)}\)