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kawashaki2001
2 năm trước
Cho hình thoi ABCD có 2 đường chéo cắt nhau tại O cho biết khoảng cách từ O đến mỗi cạnh hình thoi là h. AC = m; BD = n. Chứng Minh Rằng: $\dfrac{1}{$m^{2}$ }$ + $\dfrac{1}{$n^{2}$ }$ = $\dfrac{1}{$Ah^{2}$ }$
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