[toán 9] tìm giá trị biểu thức

V

vipboycodon


Ta có $\sqrt{14-6\sqrt{5}}$
= $\sqrt{\sqrt{5^2}-2.3\sqrt{5}+3^2}$
= $\sqrt{(9-\sqrt{5})^2}$
= $9-\sqrt{5}$
=> $a = 9 , b= -1$
$Ta có: a+b=8$
 
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