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設上底x釐米,下底y釐米 y=2x-1 (x+y)*6/2=48 (x+2x-1)*3=48 3x-1=16 3x=17 x=17/3 y=2×17/3-1=31/3 答:上底17/3釐米,下底31/3釐米
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