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先求出一份的長:(12+16)÷(7-3),=28÷4,=7(釐米),長是:7×7=49(釐米),寬是:7×3=21(釐米),原來的面積是:49×21=1029(平方釐米);答:原來長方形的面積是1029平方釐米.故答案為:1029.
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