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x=5是關於x的方程ax-8=20+a的解 5a-8=20+a 5a-a=20+8 4a=28 a=7 設甲數是x x-(100-x)=50 x-100+x=50 2x=150 x=75 100-x=25 甲數是75,乙數是25
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