trong mat phang vs he toa do Oxy,cho hinh chu nhat ABCD .dinh B thuoc duong thang
d1:2x-y+2, dinh C \in duong thang d2:x-y-5=0 .goi H la hinh chieu B duong cheo AC ,biet M(\frac{9}{5};\frac{2}{5}), 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