Bài 5 (0,75đ): Cho hình chữ nhật ABCD có chiều dài bằng 12cm, chiều rộng bằng 9cm. Tính độ dài đoạ AC? Bài 6 (0,75đ):Cho tam giác ABC (AB < AC), kẻ đường cao AH (He BC). Trên AH lấy điểm E. So sánh ЕВ, ЕС? Bài 7 (0,75đ): Cho hình vẽ, G là trọng tâm của tam giác MNP, MH = 24cm. Tính MG? Bài 8 (2,0đ): Cho tam giác ABC, gọi H là trung điểm của AB. Trên tia đối của tia HC lấy điểm M sao cho HM = HC. a) Chứng minh: AM = BC b) Vẽ đường trung tuyến BK (K e AC), đường thẳng AM cắt đường thẳng BK tại N. Chứn minh A là trung điểm của của MN Bài 9(1,0đ): Tính giá trị của biểu thức A = 5x^2018.5y^2017+2018 tại x, y biết (x+1)010+(y-1)²020 =0

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