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anh160401
2 năm trước
cho tứ giác ABCD có góc A= góc B=90 độ. a) Chứng minh AD//BC. b) Cho góc D=2 góc C. tính góc D, góc C. c) Cho góc D - góc c =20 độ, tính góc D , góc C
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