ai cha so.tao cung so ma.ma tao vao lau rui.thi xong tot ngiep la vao.de thi thui dai hoc lan thu hai cua khoa luyen thi cap toc.sao ma tam giac IOM vuong can tai O duoc vay may
cho toi hoi teo.cho ham so y=x^3+3x^2+m voi m la tham so thuc.tim m de do thi ham so co hai cuc tri A,B sao cho goc AOB bang 135 do.
bai nay khong tim ra m thoa man dung khong