Cho M(2;4). Viết PTĐT (d) qua M cắt 2 trục tại A,B sao cho

a) $\Delta OAB $ vuông cân

b) $\left| {OA+OB } \right|$ nhỏ nhất

c) Đoạn thẳng AB nhỏ nhất
a. Em tham khảo câu a) tại đây

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