Cho đường thẳng m, điểm A thuộc đường thẳng m và điểm B không thuộc đường thẳng m.
a) Vẽ hình và viết kí hiệu.
b) Có những điểm khác điểm A mà cùng thuộc đường thẳng m không? Hãy vẽ hai điểm như thế và viết kí hiệu.
c) Có những điểm không thuộc đường thẳng m mà khác với điểm B không? Hãy vẽ hai điểm như thế và viết kí hiệu.
Giải cách làm dùng mình luôn!
a, A ∈ m; B ∉ m.
B, có những điểm khác điểm A mà cũng thuộc đường thẳng m, chẳng hạn hai điểm C và D: C ∈ m, D ∈ m.
C, Có những điểm khác mà không thuộc đường thẳng m, chẳng hạn hai điểm M và N: M ∉ m, N ∉ n
trả lời sai 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