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設原長為a,寬為b 則有a*b=100 (1/4)a=4b 解之得a=40 b=2.5 則正方形邊長為4b=10 正方形面積=10*10=100平方釐米 我說複雜了.. 設原長a,寬b. ab=100 變成正方形以後,面積S=(1/4)a*4b=ab=100
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