trong mat phang oxy cho A(√2;√2),B(2√2;0),C(√2;−√2).cac duong thang d1,d2 cung di qua goc toa do va hop voi nhau 1 goc 45 do  biet d1 cat AB tai M. d2 cat BC tai N. khi tam giac OMN co dien tich be nhat hay tim M va viet phuong trinh duong thang d1,d2.

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