Mong giúp 5, 5×√(-1/5)^2 6, √(3+√5)^2 7, √(5-√5)^2 8, 3√(-1,5)^2-4√(-0,5)^2 9, 4×√(-3)^6+5×√(-2)^4 10, √(4-√11)^2+√11 11,

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1. Câu 5:

   `5*\sqrt{(-1/5)^2}=5*|-1/5|=5*1/5=1`

   Câu 6:

   `\sqrt{(3+\sqrt{5})^2}=|3+\sqrt{5}|=3+\sqrt{5}`

   Câu 7:

   `\sqrt{(5-\sqrt{5})^2}=|5-\sqrt{5}|=5-\sqrt{5}`

   Câu 8:

   `3\sqrt{(-1,5)^2}-4\sqrt{(-0,5)^2}=3|-1,5|-4|-0,5|`

   `=3*1,5-4*0,5=4,5+2=2,5`

   Câu 9:

   `4\sqrt{(-3)^6}+5\sqrt{(-2)^4}=4\sqrt{[(-3)^3]^2}+5\sqrt{[(-2)^2]^2`

   `=4|(-3)^3|+5|(-2)^2|=4*27+5*4=128`

   Câu 10:

   `\sqrt{(4-\sqrt{11})^2}+\sqrt{11}=|4-\sqrt{11}|+\sqrt{11}=4-\sqrt{11}+\sqrt{11}=4`

   Câu 11:

   `\sqrt{(\sqrt{8}-7)^2}-\sqrt{8}=|\sqrt{8}-7|-\sqrt{8}=-\sqrt{8}+7-\sqrt{8}=7-4\sqrt{2}`

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