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trandungyh
2 năm trước
Cho 3 đường thằng: d1 y=2x+3 d2 y=-x+4 d3 y=mx+m-1 a/ Vẽ hai đường thẳng d1 ; d2 trên cùng 1 mặt phằng toạ độ. b/ Tính góc tạo bởi (d1) với trục Ox (làm tròn đến phút) c/ Tìm m để 3 đường thẳng trên đồng quy làm câu b thôi nha
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