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一個長方體,高截去2cm,表面積就减少了24平方cm,剩下的部分正好是一個正方體:說明原長方體的底面是正方形,設底面邊長為X,則,2X*4=24 X=3 cm,故長方體的高為:3+2=5cm 原長方體的表面積是:5*3*4(4個側面)+ 3*3*2(2個底面)= 78平方釐米
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