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令y=-5分之12x+12=0,算出X= -1那麼影像與橫軸的交點座標為(-1,0), 再令X=0,則y=-5分之12x+12= -12/5那麼影像與縱軸交點座標為(0,-12/5) 面積S=(1*12/5)/2=6/5
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