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根據大長方形的長可知:小長方形的長是小長方形寬的3倍;根據大長方形的寬可知:小長方形的長+小長方形的寬=20釐米;20÷(3+1)=20÷4=5(釐米)5×3=15(釐米)15×5=75(平方釐米)答:每塊長方形地磚的面積是75平方釐米.
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