解:
第一次截去:1×1/2=1/2(米),还剩下:1-1/2=1/2(米)
第二次截去:1/2×1/2=1/4(米),还剩下:1-1/2-1/4=1/4=1/2×1/2(米)
第三次截去:1/4×1/2=1/8(米),还剩下:1-1/2-1/4-1/8=1/8=1/2×1/2×1/2(米)
第四次截去:1/8×1/2=1/16(米),还剩下:1-1/2-1/4-1/8=1/16=1/2×1/2×1/2×1/2(米)
......
所以,第七次截去后剩下:1/2×1/2×1/2×1/2×1/2×1/2×1/2=1/128(米)
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