Q1. 2 3 4 5 6 7 8 11 10 __
A:13
Q2. 0 3 1 2 -4 5 -11 __
A:20
Q3.有一繩長若干,欲用繩長量井深,已知此繩對折後垂入井中
尚餘2.5公尺在井外,3折後垂入井中卻不足1公尺,問井深?
A:8公尺
麻煩各位高手了謝謝。
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