Toán Lớp 9: Tính $A^{2}$ = ($\sqrt{12-3\sqrt{7} }$ – $\sqrt{12+3\sqrt{7} }$ )^2
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Toán Lớp 9: Tính $A^{2}$ = ($\sqrt{12-3\sqrt{7} }$ – $\sqrt{12+3\sqrt{7} }$ )^2
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