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把A點(或點B)代入一次函數解析式得:a=-1,所以一次函數解析式為y=-x+1設一次函數與x軸的交點為C,當y=0時,-x+1=0,得x=1所以C(1,0)所以三角形ABO面積=三角形AOC+三角形BOC =1/2×1×2+1/2×1×1 =1.5
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