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解設甲邊長是x釐米,乙邊長是20-x釐米 x²;-(20-x)²;=40 x²;-(400-40x+x²;)=40 40x-400=40 40x=440 x=11 甲的面積:11×11=121平方釐米 乙的面積:121-40=81平方釐米
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