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