点A的坐标为（1,0）,点B在直线y=-x上运动,当线段AB最短时,求点B坐标
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点A的坐标为（1,0）,点B在直线y=-x上运动,当线段AB最短时,求点B坐标
点A的坐标为（1,0）,点B在直线y=-x上运动,当线段AB最短时,求点B坐标
点A的坐标为（1,0）,点B在直线y=-x上运动,当线段AB最短时,求点B坐标
点到线的最短距离是点向该线做垂线 因为直线与x夹角45度 所以ABO为等腰直角三角形 AB=BO=2分之根号2倍的AO AO=1 BO=2分之根号2
在B分别向xy做垂线 垂线与轴交点就是B的坐标
由于做完还是等腰直角三角形 所以议案用上面的共识 可知B点坐标是（0.5,-0.5）
作图可知 B在x下方 y的右方 所以 横坐标正 纵坐标为负
When AB is perpendicular to line y =-x could we get the shortest AB. Since AB is perpendicular to y = -x, then the slope of line AB is +1 and thus line AB could be expressed by y = x - 1 (it passes th...
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When AB is perpendicular to line y =-x could we get the shortest AB. Since AB is perpendicular to y = -x, then the slope of line AB is +1 and thus line AB could be expressed by y = x - 1 (it passes through A(1,0) and the slope is +1), hence we have:
y = x - 1 and y = -x => B(0.5, -0.5).
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