[Toán 9] tính giá trị biểu thức

H

hthtb22

$$\LARGE \sqrt{4-2\sqrt{3}}=\sqrt{(\sqrt{3}-1)^2}=\sqrt{3}-1$$
$$\LARGE \sqrt{12+6\sqrt{3}}=\sqrt{(3+\sqrt{3})^2}=3+\sqrt{3}$$
$$\LARGE T=\sqrt{3}-1-(3+\sqrt{3})=-4$$
 
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