Question

A, \(2\sqrt{5}-\sqrt{45}+3\sqrt{80}-4\sqrt{20}\)

B.\(\sqrt{12}-2\sqrt{48}+\dfrac{8}{5}\sqrt{75}\)

C.\(\sqrt{12}+3\sqrt{\dfrac{4}{3}}-18\sqrt{\dfrac{25}{27}}-\sqrt{48}\)

Answer 1

`a)2\sqrt{5}-\sqrt{45}+3\sqrt{80}-4\sqrt{20}`

`=2\sqrt{5}-3\sqrt{5}+3.4\sqrt{5}-4.2\sqrt{5}`

`=2\sqrt{5}-3\sqrt{5}+12\sqrt{5}-8\sqrt{5}`

`=3\sqrt{5}`

_____________________________________________________

`b)\sqrt{12}-2\sqrt{48}+8/5\sqrt{75}`

`=2\sqrt{3}-2.4\sqrt{3}+8/5 .5\sqrt{3}`

`=2\sqrt{3}-8\sqrt{3}+8\sqrt{3}=2\sqrt{3}`

_____________________________________________________

`c)\sqrt{12}+3\sqrt{4/3}-18\sqrt{25/27}-\sqrt{48}`

`=2\sqrt{3}+3. 2/3\sqrt{3}-18. 5/9\sqrt{3}-4\sqrt{3}`

`=2\sqrt{3}-2\sqrt{3}-10\sqrt{3}-4\sqrt{3}`

`=-14\sqrt{3}`

Answer 2

Mn giúp mình vs

Mik cảm ơn 

 

Answer 3

a) \(=2\sqrt{5}-3\sqrt{5}+12\sqrt{5}-8\sqrt{5}=3\sqrt{5}\)

b) \(=2\sqrt{3}-8\sqrt{3}+8\sqrt{3}=2\sqrt{3}\)

c) \(=2\sqrt{3}+2\sqrt{3}-10\sqrt{3}-4\sqrt{3}=-10\sqrt{3}\)