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高變不變,如果高不變,用兩個面積等式相除,就可求出面積減少後底邊的長度 設面積減少後底邊長為xcm,則(10×h/2):(x×h/2)=80:(80-20),可求出x=7.5cm,所以,底邊應縮短10-7.5=2.5釐米
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