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题目 Cau 60. Duong cong y=x^4-5x^2+4 cat truc hoanh tai bon diem phan biet A, B, C. D co hoanh do tang dan.Tinh cos BEC voi E (2:3). A A cos BEC B. cosBEC=(2√2)/5 C. cosBEC=(2√7)/7 D. cosBEC=(√6)/6 相关知识点: 试题来源: 解析 A 反馈 收...