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長和寬的和是 18÷2=9(釐米) 長是 9×(5+4)分之5=5(釐米) 寬是 9-5=4(釐米) 實際長是 5÷1/200=1000(釐米)=10(米) 實際寬是 4÷1/200=800(釐米)=8(米) 實際面積是 10×8=80(平方米)
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