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長:寬=2:1,長和寬的和的總份數:1+2=3,長與寬的和:54÷2=27(分米),則長為:27×23=18(分米),寬為:27×13=9(分米),長方形的面積:18×9=162(平方分米).答:這個長方形的面積是162平方分米.
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