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Câu 19:

Cho điểm $M(1 ;-3), N(-2 ; 1)$

Câu 19: Cho điểm M(1;−3),N(−2;1)M(1 ;-3), N(-2 ; 1)M(1;−3),N(−2;1) Khi đó độ dài đoạn MN bằng

Thông tin câu hỏi

Câu 19:

Cho điểm $M(1 ;-3), N(-2 ; 1)$ Khi đó độ dài đoạn MN bằng