a) the actual can not be 4.06m because it exceeds the upper limit of 4.05m.
b) If the rope is cut into 43 equal lengths, each length is 4.0/43=9.3cm.
If each length is 10cm correct to the nearest 1cm , the actual lenght is between
10+0.5=10.5cm and 10-0.5=9.5cm .
Therefore it is not possible to have such arrangement because the lower limit
9.5cm is still longer than the actual length of 9.3cm.
可能实际长度超过406厘米吗？
可以截成43段，每段长10厘米吗（精确到1厘米）？
b)no (400cm/43+10)*43 is greater than410
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