Xét Vị Trí Tương đối Của Hai đường Thẳng D1:x−2y+1=0 Và D2

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Xét vị trí tương đối của hai đường thẳng d1:x−2y+1=0 và d2:−3x+6y−10=0 . A. Trùng nhau. B. Song song. C. Vuông góc với nhau. D. Cắt nhau nhưng không vuông góc nhau. Đáp án và lời giải Đáp án:B Lời giải:Lời giải d1:x−2y+1=0d2:−3x+6y−10=0→1−3=−26=1−10→d1||d2. Chọn B

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