两条直线平行系数满足的条件A1x+B1y+C1=0l2:A2x+B2y+C2=0因为平行,所以斜率相等A1/B1=-A2/B2,-C1/B1≠-C2/B2有一次碰到题目要用A1/C1≠ A2/C2老实说要看情况?
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![两条直线平行系数满足的条件A1x+B1y+C1=0l2:A2x+B2y+C2=0因为平行,所以斜率相等A1/B1=-A2/B2,-C1/B1≠-C2/B2有一次碰到题目要用A1/C1≠ A2/C2老实说要看情况?](/uploads/image/z/7997488-16-8.jpg?t=%E4%B8%A4%E6%9D%A1%E7%9B%B4%E7%BA%BF%E5%B9%B3%E8%A1%8C%E7%B3%BB%E6%95%B0%E6%BB%A1%E8%B6%B3%E7%9A%84%E6%9D%A1%E4%BB%B6A1x%2BB1y%2BC1%3D0l2%EF%BC%9AA2x%2BB2y%2BC2%3D0%E5%9B%A0%E4%B8%BA%E5%B9%B3%E8%A1%8C%2C%E6%89%80%E4%BB%A5%E6%96%9C%E7%8E%87%E7%9B%B8%E7%AD%89A1%2FB1%3D-A2%2FB2%2C-C1%2FB1%E2%89%A0-C2%2FB2%E6%9C%89%E4%B8%80%E6%AC%A1%E7%A2%B0%E5%88%B0%E9%A2%98%E7%9B%AE%E8%A6%81%E7%94%A8A1%2FC1%E2%89%A0+A2%2FC2%E8%80%81%E5%AE%9E%E8%AF%B4%E8%A6%81%E7%9C%8B%E6%83%85%E5%86%B5%3F)
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两条直线平行系数满足的条件A1x+B1y+C1=0l2:A2x+B2y+C2=0因为平行,所以斜率相等A1/B1=-A2/B2,-C1/B1≠-C2/B2有一次碰到题目要用A1/C1≠ A2/C2老实说要看情况?
两条直线平行系数满足的条件
A1x+B1y+C1=0
l2:A2x+B2y+C2=0
因为平行,所以斜率相等
A1/B1=-A2/B2,-C1/B1≠-C2/B2
有一次碰到题目要用A1/C1≠ A2/C2
老实说要看情况?
两条直线平行系数满足的条件A1x+B1y+C1=0l2:A2x+B2y+C2=0因为平行,所以斜率相等A1/B1=-A2/B2,-C1/B1≠-C2/B2有一次碰到题目要用A1/C1≠ A2/C2老实说要看情况?
如果直线垂直x轴
则B1=B2=0
此时就后面那个了