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Minhchung
2 năm trước
A= $\sqrt{10-2\sqrt{21} }$+$\sqrt{10-2\sqrt{21} }$ =) $A^{2}$ = ($\sqrt{10-2\sqrt{21} }$+$\sqrt{10-2\sqrt{21} }$)^2 = 2 $\sqrt{(10-2\sqrt{21}) +({10-2\sqrt{21} })}$ + 10 + 2$\sqrt{21}$ +10 - 2$\sqrt{21}$ Cho em hỏi bước cúi cùng sao ra được vậy ẹ
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