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直線3x-4y-7=0 K=4/3所以垂直於它的直線K1=-4/3設垂直於直線3x-4y-7=0的直線為:y=-4/3X+a當X=0時y=a當y=0時X=3/4a所以直線y=-4/3X+a與兩座標圍成的三角形周長為:I a I+I 3/4a I+I根號(1+3/4的平方)a I=12即…
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