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假設原來正方形的邊長為a,原來的正方形面積為:S1=a的平方邊長新增5分之2後變為:a(1+2/5)=7a/5.邊長新增後的總面積為:S2=(7a/5)x(7a/5)=a的平方x49/25.因為總面積新增了96平方釐米,所以S2-S1=a的平方x49/25-a的…
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