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由題意可知,此長方體底面是正方形,可設底面邊長為x釐米: 得:4 * 2 * x = 56 x = 7 故原長方體高= 7 - 2 = 5釐米 可得長方體體積= 7 * 7 * 5 = 245平方釐米
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