trong mat phang vs he toa do Oxy,cho hinh chu nhat ABCD .dinh B thuoc duong thang
d1:2x−y+2, dinh C ∈ duong thang d2:x−y−5=0.goi H la hinh chieu B duong cheo AC ,biet M(95;25),K(9;2) lan luot la trung diem AH,CD. TIM toa do cac dinh hinh chu nhat biet hoanh do diem C lon hon 4