Rút gọn A=$\sqrt{\frac{7\sqrt{2}+8}{5\sqrt{2}-4}}$
Rút gọn A=$\sqrt{\frac{7\sqrt{2}+8}{5\sqrt{2}-4}}$
Started By happypolla, 14-05-2016 - 22:42
#1
Posted 14-05-2016 - 22:42
#2
Posted 15-05-2016 - 05:14
Rút gọn A=$\sqrt{\frac{7\sqrt{2}+8}{5\sqrt{2}-4}}$
$A=\sqrt{\frac{7\sqrt{2}+8}{5\sqrt{2}-4}}= \sqrt{\frac{(7\sqrt{2}+8)(5\sqrt{2}+4)}{(5\sqrt{2}-4)(5\sqrt{2}+4)}}=\sqrt{3+2\sqrt{2}}=1+\sqrt{2}$
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