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Nguyễn Thị Minh Ánh
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2022-10-27 18:39:46
9x2 + 9xy - x - y = (9x2 + 9xy) - (x + y)
= 9x (x + y) - (x + y)
= (x + y) (9x - 1)
2022-10-27 18:35:58
Ta có: E là trung điểm AD
F là trung điểm BC
=> EF là đường trung bình hình thang ABCD
=> EF = (AB + CD) : 2 = (10 + 16) : 2 = 26 : 2 = 13 (cm)