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設y=ax+b與坐標軸所交的點為(0,b)(-b/a,0) 三角形面積為1可得(-b/a * b)的絕對值=2 又因為過M點得2=-2a+b 得a=-1/2 b=1或a=-2 b=-2 方程為y=-1/2x+1或y=-2x-2
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