Given the line r of equation y = mx + q.The line r' of equation y = Mx + Q is perpendicular to r if:
A、M = – 1/m
B、M = –2/m
C、M = – m
D、Q = – 1/q
E、Q = q
发布时间：2025-07-22 06:29:39
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答案：A
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