First cut off (2/5) of the full length of a steel bar, and then connect (2/5) meters. At this time, the steel bar is longer than the original one, and the length of the original steel bar is less than how many meters
把一根钢筋先截去全长的(2/5)，再接上(2/5)米，这时的钢筋比原来长，原来的钢筋的长度小于多少米
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