Mathematics, 26.07.2021 16:30 genyjoannerubiera

Cho hình thang ABCD( A=D=90°) đường chéo AC và BD vuông nhau. Chứng minh: 1/AD^2=1/AC^2+1/BD^2

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Cho hình thang ABCD( A=D=90°) đường chéo AC và BD vuông nhau. Chứng minh: 1/AD^2=1/AC^2+1/BD^2...