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Mathematics, 11.09.2021 14:00 angelhusted213
Cho hình bình hành ABCD. Đường phân giác ngoài của các góc tại các đỉnh A, B, C, D cắt nhau tại M, N, P, Q. a) CMR: Tứ giác MNPQ là hình chữ nhật.
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Cho hình bình hành ABCD. Đường phân giác ngoài của các góc tại các đỉnh A, B, C, D cắt nhau tại M, N...
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