( 4 căn 20 - 3 căn 125 + 15 can 1/5 ) : căn 5

2 câu trả lời

($4\sqrt{20}$ `-` $3\sqrt{125}$ `+` $15\sqrt{\dfrac{1}{5}}$) : $\sqrt{5}$

`=` ( $8\sqrt{5}$ `-` $15\sqrt{5}$ `+` $3\sqrt{5}$) : $\sqrt{5}$

`=` ($3\sqrt{5}$ `-` $7\sqrt{5}$) : $\sqrt{5}$

`=` `-` ($4\sqrt{5}$) : $\sqrt{5}$ `

`=` `- 4`

#Ling

 

Answer

`(4\sqrt{20} - 3\sqrt{125} + 15 . \sqrt{1/5}) : \sqrt{5}`

`= (8\sqrt{5} - 15\sqrt{5} + 3\sqrt{5}) : \sqrt{5}`

`= (-7\sqrt{5} + 3\sqrt{5}) : \sqrt{5}`

`= -4\sqrt{5} : \sqrt{5}`

`= -4`

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