1) ( 20đ ) a) tìm nghiệm âm của đa thức : P(x)= ( x-5 ).(2x∧3+16) ? 2) ( 20đ ) cho Δ ABC vuông tại A có AB=6 (cm), AC=8 (cm) a) Tính BC ? b) So sánh góc ACB và góc CBA ? c) Trên tia đối của tia AB lấy điểm E sao cho AE = AB. Chứng minh Δ CEB cân tại E ? 3) (nâng cao) 10đ cho Δ ABC vuông tại A có AB < AC. Kẻ tia phân giác BH ( H thuộc AC ). Trên cạnh BC lấy điểm E sao cho BE = BA a) Chứng minh Δ ABH = ΔEBH ? b) Chứng minh AH < HC ? c) Qua điểm C kẻ đường thẳng vuông góc với đường thẳng BH tại M và cách tia BA tại Q . Qua B, Kẻ đường thẳng vuông góc với BC cắt CQ tại N . Chứng minh QE // BN ? Nhớ kẻ hình và chứng minh giúp em với ạ xin cảm ơn nhiều !!! :))))

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