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題寫錯了,應該是 一個長方形長15釐米,寬9釐米,這個長方形的周長與一個正方形的周長相等. 長方形的周長=15*2+9*2=48 正方形的周長=48,邊長=48/4=12 正方形面積=12*12=144平方釐米
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