[toán 9 ] bài tập căn bậc 2

C

conan98md

bài 2

$\frac{10+2\sqrt[]{10}}{\sqrt[]{5}+\sqrt[]{2}} + \frac{8}{1-\sqrt[]{5}}$

= $\frac{2\sqrt[]{10(\sqrt[]{5}+\sqrt[]{2}}}{\sqrt[]{5}+\sqrt[]{2}} +\frac{8(1+\sqrt[]{5}}{-4}$

= $2\sqrt[]{10}- 2- 2\sqrt[]{10}$

= -2
 
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