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邊長應該是整數吧 這樣則周長是2×(5+7)=24的倍數 所以周長是48釐米 長48÷2×7÷(7+5)=14 寬48÷2×5÷(7+5)=10 14×10=140 答:周長48釐米,面積140平方釐米
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