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3X+4Y-12=0的斜率為-3/4 直線L的斜率為4/3 直線L的方程:y=4x/3+k 直線L與坐標軸交點(0,k)(-3k/4,0) |k|+|-3/4k|+√(k^2+9k^2/16)=24 |k|+|3k/4|+|5/4k|=24 3|k|=24 k=±8 直線L的方程:y=4x/3±8
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