giúp em hai bài này cái cần ngay trong đêm nay

K

kimhuynhjung

câu 1 [tex]\sqrt{8+2\sqrt15}[/tex]+ [tex]\sqrt{8-2\sqrt15}[/tex] vì minh` ko hieu de`` lam phai ko
 
K

kimhuynhjung

<--> [tex]\sqrt{3+2\sqrt3\sqrt5+5}[/tex] +[tex]\sqrt{3-2\sqrt3\sqrt5+5}[/tex]
<--> [tex]\sqrt{({\sqrt3+\sqrt5})^2}[/tex]+[tex]\sqrt{({\sqrt3-\sqrt5})^2}[/tex]
<--> [tex]\sqrt3+\sqrt5[/tex]+[tex]\sqrt5-sqrt3[/tex]
<--> 2[tex]\sqrt5[/tex]
 
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K

kimhuynhjung

<--> [tex]\sqrt{8+2.2\sqrt2\sqrt3+3}[/tex] +[tex]\sqrt{8-2.2\sqrt2\sqrt3+3}[/tex]
<--> [tex]\sqrt{({2\sqrt2+\sqrt3})^2}[/tex]+[tex]\sqrt{({2\sqrt2-\sqrt3})^2}[/tex]
<--> [tex]2\sqrt2+\sqrt3[/tex]+[tex]\sqrt3-2\sqrt2[/tex]
<--> 2[tex]\sqrt3[/tex]
 
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